Equilibrium — practice questions

258 curated practice questions from Equilibrium (Chemistry JEE Advanced, NTA Exams) — 212 hard, 46 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• Arrange the following acids in increasing order of their acid strength : I. HClO 4 II. H 2 SO 4 III. H 3 PO 4
• Assertion (A) : Addition of HCl(aq.) to HCOOH(aq.) decreases the ionization of HCOOH. Reason (R) : Common ion effect of…
• Assertion (A) : [Al(H 2 O) 6 ] 3+ is a stronger acid than [Mg(H 2 O) 6 ] 2+ . Reason (R) : Size of [Al(H 2 O) 6 ] 3+…
• At constant temperature, the equilibrium constant (K p ) for the decomposition reaction N 2 O 4 ⇌ 2NO 2 is expressed by…
• During the titration of weak diprotic acid H 2 A against strong base NaOH, the pH of the solution half-way to the first…
• For the gas phase reaction, C 2 H 4 (g) + H 2 (g) ⇌ C 2 H 6 (g) ; ∆Hº = –136.8 kJ mol –1 carried out in a vessel, the…
• What is the equilibrium [OH – ] in 0.1413 M H 2 CO 3 ? H _ 2 CO _ 3 + H _ 2 O H _ 3 O ^ + + HCO _ 3 ^ - (K a = 4.30 ×10…
• At 90°C, pure water has [H 3 O + ] as 10 –6 mole litre –1 . What is the value of K w at 90°C?
• The pK a of acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2–3 and the pH in…
• Assertion (A) : H 3 BO 3 is aprotic acid. Reason (R) : Borax is salt of H 3 BO 3 and NaOH ; its aqueous solution is…
• If 0.1 mol of salt is added to 1L water, which of these salts is expected to produce the most acidic solution ?
• What volume of 0.40 M NH 3 solution must be added to 1.0 L of 0.10 M NH 4 Cl solution to give a buffer having pH of…
• Identify the correct order of solubility of Na 2 S, CuS and ZnS in aqueous medium.
• Assertion : For the reaction A ( ~g )+ B ( ~g ) 2 AB ( ~g ) at the given temperature, there will be no effect by…
• On decreasing the pH from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from…
• Effect of temperature on the equilibrium process is analyzed by using the thermodynamics. From the thermodynamics…
• How many grams of AgCl (K sp = 1.8 × 10 –10 ) will dissolve in 1.0 L of 6.0 M NH 3 (K b = 1.8 × 10 –5 ). The K…
• The pH of 10 –8 M solution of HCl in water is (1981)
• Which of the following factors will favour the backward reaction ? Cl 2 (g) + 3F 2 (g) ⇌ 2ClF 3 (g) ; ∆H = –ve
• Consider the reaction NaBr ( aq )+ H _ 2 SO _ 4 ( aq ) NaHSO _ 4 ( aq )+ HBr ( aq ) .
• For the reversible reaction, N 2 (g) + 3H 2 (g) ⇌ 2NH 3 (g) at 500ºC, the value of K p is 1.44 × 10 –5 when partial…
• The solubility of silver benzoate (C 6 H 5 COOAg) in H 2 O and in a buffer solution of pH = 2, 3, and 4 are S 1 , S 2 …
• Some quantity of water is contained in a container as shown in figure below. As neon is added to this system at…
• Given the following reactions and associated equilibrium constants, select the correct expression for the third…
• These 3 questions refer to the following experiment. Some Fe(NO 3 ) 3 solution is added to KSCN solution and a dark red…
• The equilibrium constant for the decomposition of water, [ H _ 2 O ( ~g ) H _ 2 ( ~g )+ 1 2 O _ 2 ( ~g ) ] is given by :
• If 112 mL of HCl(g) at S.T.P. conditions become the solute in 500 mL of water solution, what will be the pH of this…
• Calcium lactate is a salt of weak acid i.e., lactic acid having general formula Ca(Lac) 2 . Aqueous solution of salt…
• A certain buffer solution contains equal concentration of X – and H X . The K b for X – is 10 –10 . The pH of the…
• For the reaction : PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g), The forward reaction at constant temperature is favoured by
• Assertion (A) : Aqueous solution of ammonium carbonate is basic. Reason (R) : Acidic or Basic nature of a salt solution…
• Assertion (A) : When aqueous, solution of CH 3 COONH 4 is diluted, then its degree of hydrolysis increases. Reason (R)…
• Yield of NH 3 in Haber’s process N _ 2( ~g ) +3 H _ 2( ~g ) ⇌ 2NH 3(g) , ∆H = – 22 kcal; can be increased by
• In the reaction : A + B ⇌ 2C + D. The initial concentration of A and B are 1M each. The value of K c is 10 8 . What is…
• The product of the concentrations of the ions of an electrolyte raised to power of their coefficients in the balanced…
• H 3 PO 4 is a tribasic acid with pK _ a _ 1 , pK _ a _ 2 and pK _ a _ 3 2.12, 7.21, and 12.32, respectively. It is used…
• When equal volumes of the following solutions are mixed, precipitation of AgCl (K sp = 1.8 × 10 –10 ) will occur only…
• A solution is prepared by mixing 100 mL 0.50 M hydrazoic acid (HN 3 ), whose K a = 3.6 × 10 –4 , with 400 mL of 0.10M…
• These 3 questions refer to the following experiment. Some Fe(NO 3 ) 3 solution is added to KSCN solution and a dark red…
• For a sparingly soluble salt A p B q , the relationship of its solubility product (L s ) with its solubility (S) is…
• 0.2 g sample of benzoic acid, C 6 H 5 COOH is titrated with 0.12 M Ba (OH) 2 solution. What volume of Ba(OH) 2 solution…
• A certain weak acid has a dissociation constant of 1.0 × 10 –4 . The equilibrium constant for its reaction with a…
• A solution containing a mixture of 0.05 M NaCl and 0.05 M Nal is taken. (K sp of AgCl = 10 –10 and K sp of AgI = 4 × 10…
• Volume of the flask in which the following equilibria are separately established are transferred to a flask that is…
• The concentration of hydrogen ion is a measure of acidity or alkalinity of a solution. For mono basic acids : CH _ 3…
• Assertion : The active mass of pure solids and pure liquids is taken unity. Reason : The active mass of pure solids and…
• Assertion (A) : pH of 10 –8 M HCl lies between 6 and 7. Reason (R) : For very dilute solutions of acids, H + ion…
• The correct order of increasing [H 3 O + ] in the following aqueous solution is :
• Effect of temperature on the equilibrium process is analyzed by using the thermodynamics. From the thermodynamics…
• For the chemical reaction 3 X ( g ) + Y ( g ) X 3 Y ( g ) , the amount of X 3 Y at equilibrium is affected by
• 100 mL of a solution of X is titrated with a 0.1 M solution of Y giving the following titration curve : Answer the…
• The solubility product constant of AgCN is 2.5×10 –16 . The acid dissociation constant of HCN is 6.2 × 10 –10 . Now…
• 2.5 mL of 2 5 M weak monoacidic base (K b = 1 × 10 –12 at 25ºC) is titrated with 2 15 M HCl in water at 25ºC. The…
• For the reaction, CO ( g ) + H 2 O ( g ) CO 2( g ) + H 2( g ) at a given temperature the equilibrium amount of CO 2( g…
• Assertion : The reaction quotient, Q has the same form as the equilibrium constant K eq and is evaluated using any…
• During thermal dissociation, the observed vapour density of N 2 O 4 (g) is 26.0 . The extent of dissociation of N 2 O 4…
• When NaNO 3 is heated in a closed vessel, oxygen is liberated and NaNO 2 is left behind. At equilibrium (1986)
• Assertion (A) : pH value of HCN solution decreases when NaCN is added to it Reason (R) : NaCN provides a common ion CN…
• A solution which is 10 –3 M each in Mn 2+ , Fe 2+ , Zn 2+ is treated with 10 –6 M sulphide ion. If K sp of MnS, FeS…
• Titration curve for a weak acid with a strong base is Which of the following s/are correct for the above curve ?
• Identify the correct order of solubility of Na 2 S, CuS and ZnS in aqueous medium (2002)
• The pH of 0.1 M solution of the following salts increases in the order
• Thermal decomposition of gaseous X 2 to gaseous X at 298 K takes place according to the following equation : X_ 2(g) 2…
• HX is a weak acid (K a = 10 –5 ). It forms a salt NaX (0.1 M) on reacting with caustic soda. The degree of hydrolysis…
• Assertion : For a reaction at equilibrium, the free energy for the reaction is minimum. Reason : The free energy for…
• Ag + + NH 3 [Ag(NH 3 )] + ; k 1 = 6.8 × 10 –3 [Ag(NH 3 )] + + NH 3 [Ag(NH 3 ) 2 ] + ; k 2 = 1.6 × 10 –3 then the…
• The pair of compounds which cannot exist together in solution is
• Assertion (A) : On mixing 500 mL of 10 –6 M Ca 2+ ion and 500 mL of 10 –6 M F – ion, the precipitate of CaF 2 will be…
• Assertion (A) : Increasing the temperature of an aqueous acetic acid solution decreases pH. Reason (R) : Ionization of…
• Solubility of a salt is defined as the maximum amount of a salt which can be dissolved in a given amount of solvent at…
• The precipitate of CaF 2 (K sp = 1.7 × 10 –10 ) is obtained, when equal volumes of the following are mixed (1982)
• Assertion (A) : An aqueous solution of ammonium acetate can act as a buffer. Reason (R) : Acetic acid is a weak acid…
• The solubility product constant of AgCN is 2.5×10 –16 . The acid dissociation constant of HCN is 6.2 × 10 –10 . Now…
• K sp of Mg (OH) 2 is 1 × 10 –12 . 0.01 M MgCl 2 will be precipitating at the limiting pH :
• Which of the following statements about the reaction quotient, Q are correct ?
• When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature…
• Thermal decomposition of gaseous X 2 to gaseous X at 298 K takes place according to the following equation : X 2 (g) ⇌…
• The pH of 0.1 M solution of the following salts increase in the order (1999)
• Effect of temperature on the equilibrium process is analyzed by using the thermodynamics. From the thermodynamics…
• Assertion (A) : If HA and HB are two weak non-basic acids with K a (HA) b (HB), then, the aqueous solution of NaA will…
• When one drop of a concentrated HCl is added to 1 L of pure water at 25ºC, the pH drops suddenly from 7 to 4 . When the…
• To the system H 2 (g) + I 2 (g) ⇌ 2HI (g) in equilibrium, some N 2 gas was added at constant volume. Then,
• Assertion : If some PCl 5 (g) containing labelled phosphorus 31 P is added to a system with following equilibrium…
• A certain buffer solution contains equal concentration of X – and HX. The K b for X – is 10 –10 . The pH of the buffer…
• A 0.004 M solution of Na 2 SO 4 is isotonic with 0.010 M solution of glucose at same temperature. The percentage…
• When equal volumes of the following solutions are mixed, precipitation of AgCl ( K sp = 1.8 × 10 –10 ) will occur only…
• Aqueous solutions of HNO 3 , KOH, CH 3 COOH and CH 3 COONa of identical concentrations are provided. The pair(s) of…
• If p K b for fluoride ion at 25°C is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is
• What is the pH of a solution at 25ºC that is 0.010 M in HCl and 0.025 M in HNO 3 ?
• A solution of 2M formic acid (HCOOH) is 0.95% ionized. What is the K a of formic acid ?
• For the all gas reaction at 1000 K : 2HI ⇌ H 2 + I 2 , K = 0.0344 . If you were to begin with 8.0 M of HI in a fixed…
• For the overall reaction H _ 2 ~S ( aq ) 2 H ^ + ( aq )+ S ^ 2- ( aq ) , the value of K a is 1×10 –22 . The K sp for…
• A solution of 0.1 M NaZ has pH = 8.90. The K a of HZ is
• Solubility of a salt is defined as the maximum amount of a salt which can be dissolved in a given amount of solvent at…
• Solubility product constant (K sp ) of salts of types MX, MX 2 and M 3 X at temperature ‘T’ are 4.0 × 10 –8 , 3.2 × 10…
• The best indicator for detection of end point in titration of a weak acid and a strong base is
• The oxidation of SO 2 by O 2 to SO 3 is an exothermic reaction. The yield of SO 3 will be maximum if
• The precipitate of CaF 2 ( K sp = 1.7 × 10 –10 ) is obtained when equal volumes of the following are mixed
• For a reversible reaction : A + B ⇌ C ( dx dt )=2.0 10^ 3 ~L ~mol ^ -1 ~s ^ -1 [ ~A ][ B ]-1.0 10^ 2 ~s ^ -1 [ C ]…
• The best indicator for detection of end point in titration of a weak acid and a strong base is (1985)
• When two reactants, A and B are mixed to give products C and D, the reaction quotient Q, at the initial stages of the…
• Consider the following equilibrium in a closed container N 2 O 4 (g) 2NO 2 (g) At a fixed temperature, the volume of…
• Calculate the molar concentrations of H 3 O + , HSO 4 – , and SO 4 2– in a 0.250 M solution of H 2 SO 4 . Assume K _ a…
• For the chemical reaction 3X (g) + Y (g) ⇌ X 3 Y (g) the amount of X 3 Y at equilibrium is affected by (1999)
• Variation of equilibrium constant K for the reaction 2 ~A ( ~s )+ B ( ~g ) C ( ~g )+2 D ( ~g ) is plotted against…
• Given the following K sp values : for M(OH) 4 , K sp (M) = 4.0 × 10 –19 ; for Z(OH) 2 , K sp (Z) = 1.0 × 10 –14 . One…
• The degree of dissociation of water at 25°C is 1.9 × 10 –7 % and density is 1.0 g cm –3 . The ionic constant for water…
• The variation of equilibrium constant K with temperature is represented by :
• Solubility of a salt is defined as the maximum amount of a salt which can be dissolved in a given amount of solvent at…
• Assertion : The dissociation of CaCO 3 can be represented as, CaCO 3 (s) ⇌ CaO(s) + CO 2 (g). Some solid CaCO 3 is…
• The equilibrium SO 2 Cl 2 (g) SO 2 (g) + Cl 2 (g) is attained at 25ºC in a closed container and an inert gas, helium is…
• For the reaction, [Ag(CN) 2 ] – ⇌ Ag + + 2CN – , the equilibrium constant K c at 25ºC is 4 × 10 –19 ; then Ag +…
• A mixture of weak acid is 0.1 M in HCOOH (K a = 1.8 × 10 –4 ) and 0.1 M in HOCN (Ka = 3.1 × 10 –4 ). Hence, [ H _ 3 O ^…
• The equilibrium, SO 2 Cl 2( g ) SO 2( g ) + Cl 2( g ) is attained at 25°C in a closed container and an inert gas…
• For the reaction: H 2( g ) + I 2( g ) 2HI ( g ) the equilibrium constant K p changes with
• At 90ºC, pure water has [H 3 O + ] as 10 –6 mol L –1 . What is the value of K w at 90ºC ? (1981)
• Assertion (A) : pH of water increases with an increase in temperature. Reason (R) : K w of water increases with…
• The equilibrium constant (K c ) for the reaction of a weak acid HA with strong base NaOH is 10 9 at 25ºC. Which of the…
• At 25ºC, pH of a 0.01 M solution of a monobasic acid (HA) is 4. The correct statement(s) regarding HA and its given…
• I 2 + I – ⇌ I _ 3 ^ - This reaction is set-up in aqueous medium. We start with 1 mol of I 2 and 0.5 mol of I – in 1L…
• For a reaction, A P, the plots of [A] and [P] with time at temperatures T 1 and T 2 are given below. (2018) (Assume H ^…
• The dissociation of phosgene, which occurs according to the reaction : COCl 2(g) ⇌ CO (g) + Cl 2(g) is an endothermic…
• Which of the following is (are) correct for buffer solution ?
• The pH of 10 –5 M HCl solution if 1 ml of it is diluted to 1000 ml is :
• Which of these aqueous solutions are buffers ? 1 . A solution that is 0.1 M HNO 3 and 0.1 M HCl. 2 . A solution that is…
• The dissociation of ammonium carbamate may be represented by the equation NH 4 CO 2 NH 2(s) ⇌ 2NH 3(g) + CO 2(g) ∆H°…
• 100 mL of a solution of X is titrated with a 0.1 M solution of Y giving the following titration curve : Answer the…
• Le-Chatelier’s principle : If a system at equilbrium is subjected to a change of any one of the factors such as…
• 0.1 mole of CH 3 NH 2 ( K b = 5 × 10 –4 ) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H +…
• Assertion : Addition of an inert gas at constant pressure equilibrium will support the dissociation of PCl 5 at the…
• Pure ammonia is placed in a vessel at a temperature where its dissociation constant (α) is appreciable. At equilibrium
• Consider the following reaction which proceeds predominantly from HSO _ 4 ^ - + NH _ 3 NH _ 4 ^ + + SO _ 4 ^ 2- From…
• For the reaction, N 2 O 4 (g) ⇌ 2NO 2 (g) ; if percentage dissociation of N 2 O 4 are 25%, 50%, 75% and 100%, then the…
• On heating a mixture of SO 2 Cl 2 and CO, two equilibria are simultaneously established : array l SO _ 2 Cl _ 2 ( ~g )…
• Assertion (A) : pH of HCl solution is less than that of acetic acid of the same concentration. Reason (R) : In…
• N 2 + 3H 3 ⇌ 2NH 3 Which is correct statement if N 2 is added at equilibrium condition ? (2006)
• Which among the following salts will give basic solution on hydrolysis ?
• Which among the following represent the conjugate acid/base pairs ?
• A solution which is 10 –3 M each in Mn 2+ , Fe 2+ , Zn 2+ and Hg 2+ is treated with 10 –16 M sulphide ion. If K sp of…
• For a sparingly soluble salt A p B q , the relationship of its solubility product ( L s ) with its solubility ( S ) is
• In the following reaction : HCO _ 3 ^ - + H _ 2 O CO _ 3 ^ 2- + H _ 3 O ^ + Which two substances are Bronsted bases ?
• In a 1.0 L aqueous solution when the reaction 2 Ag _ ( aq ) ^ + + Cu _ ( s ) Cu _ ( aq ) ^ 2+ +2 Ag _ ( s ) reaches…
• If for the heterogeneous equilibrium CaCO 3 (s) ⇌ CaO(s) + CO 2 (g) ; K = 1 at 1 atm, the temperature is given by :
• Statement-1 : A very dilute acidic solution of Cd 2+ and Ni 2+ gives yellow precipitate of CdS on passing hydrogen…
• The volume of the reaction flask is reduced to half of its initial value, temperature being constant. In which of the…
• When two reactants, A and B are mixed to give products C and D , the reaction quotient Q , at the initial stages of the…
• Which of the following factors will increase solubility of a well known weak base, NH 3(g) , in H 2 O ? NH 3(g) + H 2 O…
• Calculate the [NH 3 ]/[NH 4 + ] ratio in an ammonia-ammonium chloride buffer with a pH of 9.00 . (K b = 1.8 × 10 –5 for…
• Solubility product constants ( K sp ) of salts of types MX , MX 2 and M 3 X at temperature T are 4.0 × 10 –8 , 3.2 × 10…
• Passing H 2 S gas into a mixture of Mn 2+ , Ni 2+ , Cu 2+ and Hg 2+ ions in an acidified aqueous solution precipitates…
• Pure ammonia is placed in a vessel at a temperature where its dissociation constant (α) is appreciable. At equilibrium…
• The pK a of acetylsalicylic acid (aspirin) is 3.5 . The pH of gastric juice in human stomach is about 2-3 and the pH in…
• How many milliliters (mL) of a 0.0500 M NaOH (a strong base) solution should be added to 1.00 L of 0.100 M H 3 PO 4 …
• Like water, ammonia (NH 3 ) is an amphoteric substance that can be used as a solvent for acid base reactions. The phase…
• The initial rate of hydrolysis of methyl acetate (1 M) by a weak acid (H A , 1 M) is 1/100 th of that of a strong acid…
• When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature…
• When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature…
• The free energy of formation of NO is 78 kJ mol –1 at the temperature of an automobile engine (1000 K). What is the…
• Which of the following statement(s) is (are) correct?
• The solubility of A 2 X 3 is y mol dm –3 . Its solubility product is (1997)
• In reversible reaction A B , the initial concentration of A and B are a and b in moles per litre and the equilibrium…
• For the reaction: PCl 5( g ) → PCl 3( g ) + Cl 2( g ) The forward reaction at constant temperature is favoured by
• For the following reaction through stages I, II and III A I ~B I C III D quantity of the product formed (x) varies with…
• For the gas phase reaction C 2 H 4 + H 2 C 2 H 6 (Δ H = –32.7 kcal) carried out in a vessel, the equilibrium…
• Which of the following is (are) correct when 0.1 L of 0.0015 M MgCl 2 and 0.1L of 0.025 M NaF are mixed together ? (K…
• An industrial fuel, ‘water gas’ which consists of a mixture of H 2 and CO can be made by passing steam over red-hot…
• For the overall reaction H 2 S(aq) ⇌ 2H + (aq) + S 2– (aq), the value of K a is 1 × 10 –22 . The K sp for FeS is 4 × 10…
• Hydrogen carbonate and phosphate buffers in the blood prevent excess hydrogen ions [H + ] produced by metabolic…
• The K sp of Ag 2 CrO 4 is 1.1 x 10 –12 at 298 K. The solubility (in mol/L) of Ag 2 CrO 4 in a 0.1 M AgNO 3 solution is…
• A weak acid HX has the dissociation constant 1 × 10 –5 M. It forms a salt NaX on reaction with alkali. The percentage…
• A solution was prepared by mixing 10.0 mL of 0.50 M NaOH with 10.0 mL of 1.00 M acetic acid, K a =1.8 ×10 –5 . Find the…
• A certain weak acid has a dissociation constant of 1.0 × 10 –4 . The equilibrium constant for its reaction with a…
• pH of water is 7 . When a substance Y is dissolved in water, the pH becomes 11 . The substances Y is a salt of :
• For Ag 2 CO 3 , K sp = 6.2 × 10 –12 , For AgCl, K sp = 2.8 ×10 –10 . Solid Ag 2 CO 3 and solid AgCl are added to a…
• Hydrolysis constants of two salts KA and KB of weak acids HA and HB are 10 –8 and 10 –6 . If the dissociation constant…
• Which of the following solutions will have pH close to 1.0 ? (1992)
• Ag + + NH 3 [Ag(NH 3 )] + ; K 1 = 3.5 × 10 –3 [Ag(NH 3 )] + + NH 3 [Ag (NH 3 ) 2 ] + ; K 2 = 1.7 × 10 –3 then the…
• The concentration of NaOH solution is 10 –8 M. Find out the (OH – ) concentration
• The solubility of A 2 X 3 is y mol dm –3 . Its solubility product is
• Volume of the flask in which the following equilibria are separately established are transferred to a flask that is…
• Le-Chatelier’s principle : If a system at equilbrium is subjected to a change of any one of the factors such as…
• Equilibrium constant K c for the following reaction at 800K is, 4. NH _ 3 1 2 ~N _ 2 + 3 2 H _ 2 ; The value of K P for…
• KNO 3(s) dissociates on heating as : KNO 3(s) ⇌ KNO 2(s) + 1 2 O _ 2( ~g ) At equilibrium in a closed container
• The solubility products of MA, MB, MC and MD are 1.8 × 10 –10 , 4 × 10 –3 , 4 × 10 –8 and 6 × 10 –5 respectively. If a…
• What is the K b of a weak base that produces one OH – per molecule if a 0.05 M solution is 2.5% ionized ?
• The pH of a 10 –8 molar solution of HCl in water is
• For the following endothermic equilibrium established by dissociation of NH 4 HS to its components, NH 4 HS (s) ⇌ NH…
• For the reaction : PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g) , The forward reaction at constant temperature is favoured by
• CH 3 NH 2 (0.1 mole, K b = 5 × 10 –4 ) is added to 0.08 moles of HCl and the solution is diluted to one litre…
• A vessel at 1000 K contains CO 2 with a pressure of 0.5 atm. Some of the CO 2 is converted to CO on addition of…
• The equilibrium constant for this reaction is approximately 10 –3 . HPO _ 4 ^ 2- (aq.) + HCO _ 3 ^ - (aq.) H _ 2 PO _ 4…
• Thermal decomposition of gaseous X 2 to gaseous X at 298 K takes place according to the following equation : X 2 (g) ⇌…
• Equilibrium constant for two complexes are : A : K 4 [Fe(CN) 6 ] K=2.6 × 10 37 (for dissociation) B : K 3 [Fe(CN) 6 ]…
• The titration curve given below involves 1.0 M solutions of an acid and a base. Which of the following is/are correct…
• H 3 PO 4 is a tribasic acid with pK _ a _ 1 , pK _ a _ 2 and pK _ a _ 3 2.12, 7.21, and 12.32, respectively. It is used…
• Assertion (A) : If Ka of HA is 10 –3 and Ka of HB is 10 –4 at 25ºC, pH of an aqueous solution of HB will be one unit…
• Assertion (A) : Water acts as leveling solvent for various acids. Reason (R) : Leveling effect of water is due to high…
• For the reaction PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g) Which of the following sketch may represent above equilibrium ?…
• Assertion (A) : Chemical equilibrium represents a state of a reversible reaction in which measurable properties of the…
• When NaNO 3 is heated in a closed vessel, oxygen is liberated and NaNO 2 is left behind. At equilibrium
• At constant temperature, the equilibrium constant ( K p ) for the decomposition reaction N 2 O 4 2NO 2 is expressed by…
• The product of the concentrations of the ions of an electrolyte raised to power of their coefficients in the balanced…
• H _ 3 PO _ 4 + H _ 2 O H _ 3 O ^ + + H _ 2 PO _ 4 ^ - ; pK 1 = 2.15 H _ 2 PO _ 4 ^ - + H _ 2 O H _ 3 O ^ + + HPO _ 4 ^…
• Hydrogen carbonate and phosphate buffers in the blood prevent excess hydrogen ions [H + ] produced by metabolic…
• On decreasing the pH from 7 to 2, the solubility of a sparingly soluble salt ( MX ) of a weak acid (H X ) increased…
• In the preparation of CaO from CaCO 3 using the equilibrium, CaCO _ 3 ( ~s ) CaO ( ~s )+ CO _ 2 ( ~g ), (At 1 atm) K p…
• The product of the concentrations of the ions of an electrolyte raised to power of their coefficients in the balanced…
• Assertion : As a reversible system approaches equilibrium, entropy of the system increases. Reason : The state of…
• Solubility of a substance which dissolves with a decrease in volume and absorption of heat will be favoured by
• In our body, carbon dioxide (CO 2 ) combines with water (H 2 O) to form carbonic acid. H 2 O + CO 2 → H 2 CO 3 Carbonic…
• A solution is transferred to a 1 L flask, some pure ice is added and a stopper is inserted to close the flask. After…
• Amongst the following hydroxides, the one which has the lowest value of K sp at ordinary temperature (about 25ºC) is…
• These 3 questions deal with the following chemical reaction: (green solution) Ni ^ 2+ ( aq ) +6 NH _ 3 ( aq )…
• A 0.1 M sodium acetate solution was prepared. The K h = 5.6 × 10 –10
• Assertion : The addition of an inert gas under constant volume condition cause the total pressure of the system to…
• A 100 mL portion of water is added to each of the following two solutions. (i) 100 mL of 0.02 M KCl (ii) 100 mL of 0.02…
• The conjugate acid of NH _ 2 ^ - is (1985)
• Densities of diamond and graphite are 3.5 and 2.3 g/mL respectively. Increase of pressure on the equilibrium C…
• Following figure represents simulated titration curves for solutions of four acids titrated with the same standard base…
• For the reaction, PCl 5 (g) PCl 3 (g) + Cl 2 (g) The forward reaction at constant temperature is favoured by (1991)
• 100 mL of a solution of X is titrated with a 0.1 M solution of Y giving the following titration curve : Answer the…
• The solubility product constant of AgCN is 2.5×10 –16 . The acid dissociation constant of HCN is 6.2 × 10 –10 . Now…
• The concentration of hydrogen ion is a measure of acidity or alkalinity of a solution. For mono basic acids : CH _ 3…
• If pK b for fluoride ion at 25ºC is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is
• Consider the following equilibrium in a closed container N 2 O 4( g ) 2NO 2( g ) At a fixed temperature, the volume of…
• For the gas phase reaction C 2 H 4 + H 2 ⇌ C 2 H 6 (∆H = – 32.7 kcal)carried out in a vessel, the equilibrium…
• These 3 questions deal with the following chemical reaction: (green solution) Ni ^ 2+ ( aq ) +6 NH _ 3 ( aq )…
• A buffer solution of pH = 9.00 is made by dissolving ammonium chloride and ammonia in water. How many moles of ammonium…
• The species present in solution when CO 2 is dissolved in water are
• A buffer solution can be prepared from a mixture of (1999)
• When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature…
• Hydrogen carbonate and phosphate buffers in the blood prevent excess hydrogen ions [H + ] produced by metabolic…
• An acidic buffer solution can be prepared by mixing the solution of (1981)
• The K sp of Ag 2 CrO 4 is 1.1 × 10 –12 at 298 K. The solubility (in mol/L) of Ag 2 CrO 4 in a 0.1 M AgNO 3 solution is
• The equilibrium reaction : 2 AB ( aq ) 2 ~A ( aq )+ B _ 2 ( ~g ) has an equilibrium constant equal to 1.28. If the…
• In each of the following, total pressure set-up at equilibrium is assumed to be equal and is one atm with equilibrium…
• The charge balance equation of species in 0.1 M CH 3 COOH solution is given by :
• For the reaction N 2 O 4 (g) ⇌ 2NO 2 (g), the value of K p is 1.7 × 10 3 at 500 K and 1.78 × 10 4 at 600 K. Which of…
• N 2 + 3H 2 2NH 3 Which is correct statement if N 2 is added at equilibrium condition?
• Degree of hydrolysis for a salt of strong acid and weak base is :
• Which of the following statements is/are correct about the ionic product of water ?
• N 2 + 3H 2 ⇌ 2NH 3 Which is correct statement if N 2 is added at equilibrium condition ? (2006)
• Consider the equilibrium CO _ 2 CO + 1 2 O _ 2 The equilibrium constant K is given by (when α <<< 1) :
• The p K a of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in…
• Solubility of calcium phosphate (molecular mass, M) in water is W g per 100 mL at 25ºC. Its solubility product at 25ºC…
• The species present in solution when CO 2 is dissolved in water are (2006)
• An acidic buffer solution can be prepared by mixing the solutions of
• N 2 O 4 ⇌ 2NO 2 , K c = 4. This reversible reaction is studied graphically as shown in the given figure. Select the…
• These 3 questions deal with the following chemical reaction: (green solution) Ni ^ 2+ ( aq ) +6 NH _ 3 ( aq )…
• The following equilibrium is established when hydrogen chloride is dissolved in acetic acid. HCl + CH 3 COOH Cl – + CH…
• Assertion (A) : The pH of the solution at the mid point of the weak acid strong base titration becomes equal to the pK…
• A weak acid H X has the dissociation constant 1 × 10 –5 M. It forms a salt Na X on reaction with alkali. The percentage…
• For the reversible reaction, N 2( g ) + 3H 2( g ) 2NH 3( g ) at 500°C, the value of K p is 1.44 × 10 –5 when partial…
• The equilibrium 2CuI Cu 0 + Cu II in aqueous medium at 25°C shifts towards the left in the presence of
• Which of the following solutions will have pH close to 1.0?
• 100 mL of a solution of X is titrated with a 0.1 M solution of Y giving the following titration curve : Answer the…
• For the reaction ; CO (g) + H 2 O(g) ⇌ CO 2 (g) + H 2 (g), at a given temperature, the equilibrium amount of CO 2 (g)…
• Why is it necessary to take the acid-base properties of water into account when computing the hydronium ion…

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