Some Basic Concepts of Chemistry — practice questions

144 curated practice questions from Some Basic Concepts of Chemistry (Chemistry NEET, NTA Exams) — 73 easy, 29 hard, 42 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• The number of atoms of Cr and O are 6.4 × 10 10 and 9.6 × 10 10 respectively. Its empirical formula is:
• Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the…
• 0.45gm of acid (molecular mass = 90 g/mol) was exactly neutralized by 20 mL of 0.5 M NaOH. The basicity of the given…
• Number of atoms in 560g of Fe(atomic mass 56g mol -1 ) is:
• Assertion: Antiseptics are applied to living tissues. Reason: Iodine is a powerful antiseptic.
• The number of significant figures in the numbers 4.8000 and 48000.50 are respectively
• From the volume of water molecule is: (Take, density of water is 10 3 kgm –3 and Avogadro’s number = 6 × 10 23 mole –1 )
• Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentration: a. 60 ~mL M…
• The weights of two elements which combine with one another are in the ratio of their:
• 10 dm 3 of N 2 gas and 10 dm 3 of gas X at the same temperature and pressure contain the same number of molecules. The…
• In a mixture of 1 g H 2 and 8 g O 2 , the mole fraction of hydrogen is:
• To account for nitrogen's atomic weight of 14.0067, what must be the ratio of N 15 to N 14 atoms in natural nitrogen?
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• 1.0 g of magnesium is burnt with 0.56 g O 2 in a closed vessel. Which reactant is left in excess and how much? (At. wt…
• How many grams of Mg would have to react in order to liberate 4 N electrons:
• At 300 K and 1 atmosphere pressure, 10 mL of a hydrocarbon required 55 mL of O 2 for complete combustion, and 40 mL of…
• An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 mL. The volume of 0.1 N NaOH required to…
• Another product of the given equation will be: 2 C _ 17 H _ 35 COONa + CaCl _ 2 2 NaCl +
• 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia…
• An aqueous solution containing 6.5 g of NaCl of 90% purity was subjected to electrolysis. After the complete…
• For reaction, N _ 2 ( ~g )+3 H _ 2 ( ~g ) 2 NH _ 3 ( ~g ) ; identify dihydrogen (H 2 ) as a limiting reagent in the…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• When 22.4 litres of H 2 (g) is mixed with 11.2 litres of Cl 2 (g), each at S.TP, the moles of HCl(g) formed is equal to:
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The amount of sugar (C 12 H 22 O 11 ) required to prepare 2 L of its 0.1 M aqueous solution is :
• On analysis, a certain compound was found to contain 254 g of iodine (at mass 127) and 80 g oxygen (at mass 16). What…
• How much of NaOH is required to neutralise 1500 cm 3 of 0.1 N HCl? (Na = 23)
• Concentrated hydrochloric acid, when kept in open air sometimes produces a cloud of white fumes. The explanation for it…
• The total number of electrons present in 18 mL water (density 1 g/mL) is:
• Assertion : Charcoal has equal heating power than wood. Reason : Charcoal burns without producing flame or smoke…
• Molar heat capacity of ethanol is 110.4 J K -1 mol -1 . Specific heat capacity is:
• 30g of Mg and 30g of oxygen are reacted and the residual mixture contains:
• 25.3 g of sodium carbonate, Na 2 CO 3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate…
• In countries nearer to polar region, the roads are sprinkled with CaCl 2 . This is:
• 0.2595 g of an organic compound in a quantitative analysis yielded 0.35 g of the barium sulphate. The percentage of…
• Number of oxalic acid molecules in 100 mL of 0.02 N oxalic acid are:
• The density of 2M aqueous solution of NaOH is 1.28 g/cm 3 . The molality of the solution is [Given that molecular mass…
• The weight of a gas that displaces 22.4 litre air at NTP is:
• A mixture of gases contains H 2 and O 2 gases in the ratio 1 : 4 (w/w). What is the molar ratio of the two gases in the…
• The high boiling point of water is advantageous to living organisms because:
• 13.4 g of a sample of unstable hydrated salt Na 2 SO 4 .xH 2 O was found to contain 6.3 g of water. What is the number…
• A bivalent metal has an equivalent mass of 32 g eq -1 . The molecular mass of the metal nitrate is:
• In Kjeldahl's method, ammonia from 5 g of food neutralizes 30 cm 3 of 0.1N acid. The percentage of nitrogen in the food…
• The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish away is
• A vessel contains two non-reactive gases A and B. The ratio of their partial pressures is 5:2. The ratio of number of…
• Relative abundance of isotopes of element M is 24 M = 78.99%, 25 M = 10.00% and 26 M = 11.01%. What is the atomic…
• Total number of atoms of all elements present in 1 mole of ammonium dichromate is:
• Chemical equations convey quantitative information on the:
• 0.32 g of metal gave on treatment with an acid 112 mL of hydrogen at NTP. Calculate the equivalent weight of the metal.
• To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H 3 PO 3 ), the volume of 0.1 M aqueous…
• How many litres of a 0.5 N solution of an oxidising agent are reduced by 2 litres of a 2.0 N solution of a reducing…
• A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is:
• Assuming that petrol is octane (C 8 H 18 ) and has density 0.8 g/ml, 1.425 litre of petrol on complete combustion will…
• How many grams of copper will be replaced in 2 L of a 1.50 M CuSO 4 solution if the latter is made to react with 27.0g…
• Assertion: One mole of any substance at any temperature or volume always contains 6.02 × 10 23 molecules. Reason: One…
• The molarity of a solution is always related with molality as:
• The molar ratio of Fe 2 + to Fe 3 + in a mixture of FeSO 4 and Fe 2 (SO 4 ) 3 having equal number of sulphate ions in…
• Suppose all of a sudden, intermolecular forces vanishes between the molecules. The volume occupied by the molecules…
• A sample of Na 2 CO 3. H 2 O weighing 1.24 g is added to 200mL of a 0.1-N H 2 SO 4 solution. The resulting solution…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• The hydrogen ion concentration of a 10 -8 M HCl aqueous solution at 298 K (K w = 10 -14 ) is:
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• In FeSO 4 .xH 2 O and ZnSO 4 .y H 2 O, y and x respectively are:
• X gm of Ag was dissolved in HNO 3 and solution was treated with excess of NaCl. When 1.435 g of AgCl was precipitated…
• H 3 PO 4 is a tribasic acid and one of its salt is NaH 2 PO 4 . What volume of 1(M) NaOH solution should be added to 12…
• When 50 cm 3 of 0.2 N H 2 SO 4 is mixed with 50 cm 3 of 1N KOH, the heat liberated is:
• The following data are obtained when dinitrogen and dioxygen react together to form different compounds: Column I Mass…
• The chloride of a metal contains 71% chlorine by weight and the vapour density of it is 50. The atomic weight of the…
• 50 cm 3 of 0.2 N HCI is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm 3 of…
• An element A is tetravalent and another element B is divalent. The formula of the compound formed from these elements…
• 2.76 g of silver carbonate on being strongly heated yields a residue weighing:
• Assertion: Detergents with straight chain of hydrocarbons are preferred over branched chain. Reason: Detergents with…
• The volume of air containing 21% oxygen by volume at STP required, in order to convert 294 cm 3 of sulphur dioxide to…
• 25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl…
• 510 mg of liquid on vapourization in Victor Meyer's apparatus displaces 67.2 cm 3 of air at (STP). The molecular weight…
• A sample of ammonium phosphate (NH 4 ) 3 PO 4 , containing 3.18 mol of hydrogen atoms. The number of moles of oxygen…
• Assertion: Transparent soaps are made by dissolving soaps in ethanol. Reason: Ethanol makes things invisible.
• A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H 2 SO 4 . The evolved gaseous mixture is…
• Assertion : Wood is an excellent fuel. Reason : The average calorific value of seasoned wood is half to coal.
• Assertion: Clothes washed with soap using hard water do not absorb dyes evenly. Reason: Hard water contains calcium and…
• Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• A sample of dolomite contained 45% of CaCO 3 , 40% of MgCO 3 and 15% clay. Weight of sulphuric acid of 30% strength…
• The oxidation states of sulphur in the anions; 50_ 3 ^ 2- , 5_ 2 0_ 4 ^ 2- , 5_ 2 0_ 6 ^ 2- follow the order:
• 4.6 × 10 22 atoms of an element weigh 13.8g. The atomic weight of that element is:
• 3 g of oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of…
• A compound was found to contain 5.37% nitrogen. What is the minimum molecular weight of compound?
• The mass of CaCO 3 produced when carbon dioxide is bubbled through 500 mL of 0.5 M Ca(OH) 2 will be:
• The minimum amount of O 2 (g) consumed per gram of reactant is for the reaction: (Given atomic mass : Fe = 56, O = 16…
• 1 g of silver gets distributed between 10 cm 3 of molten zinc and 100 cm 3 of molten lead at 800°C. The percentage of…
• Which of the following concentration factor is affected by change in temperature?
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• The number of sodium atoms in 2 moles of sodium ferrocyanide is:
• An atom of element 'X' is 1.02 times heavier than that of an atom of 'Y'. An atom of 'Y' is 0.1809 times heavier than…
• How much K 2 Cr 2 O 7 (Molecular weight :294.19) is required to prepare one litre of 0.1 N solution in acidic medium?
• Faraday constant F is equal to (N = Avogadro's number and e =1.6 10^ -19 c )
• Calculate the g-quantity of Na 2 CO 3 which has same no. of molecules as present in no. of protons in 10 g CaCO 3 :
• Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The weight percentage of carbon in…
• The nuclidic mass of Sr had been determined on the old physical scale( 16 O = 16.0000) as 89.336. Its atomic weight as…
• C _ 2 H _ 6 ( ~g )+ nO _ 2 CO _ 2 ( ~g )+ H _ 2 O ( O ) ; In this equation, the ratio of the coefficients of CO 2 and H…
• The mass of carbon present in 0.5 mole of K 4 [Fe(CN) 6 ] is:
• Assertion: Shaving soaps contain glycerol. Reason: It prevents rapid drying.
• The enthalpy of neutralisation of NaOH with HCl is 57.1 kJ mol -1 while with CH 3 COOH, it is 56.1 kJ mol -1 This…
• The vapour density of gas A is four times that of B. If molecular mass of B is M, then molecular mass of A is:
• Equal masses of H 2 , O 2 and methane have been taken in a container of volume V at temperature 27°C in identical…
• For the following reaction, the mass of water produced from 445 g of C 57 H 110 O 6 is: 2 C_ 57 H _ 11 O _ 5(5) +163 O…
• The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is:
• 2g of mixture of CO and CO 2 on reaction with excess I 2 O 5 produced 2.54 g of I 2 . What would be the mass % of CO 2…
• 4g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its…
• Which one of the following has maximum number of atoms?
• Consider the statements mentioned below. (i) Shaving soaps contain glycerol. (ii) A gum, rosin is added, while making…
• 12 g of Mg (atm mass 24) will react completely with sulphuric acid to give:
• 25 mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titre value of…
• The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are:
• An organic compound is estimated through Dumas method and was found to evolve 6 moles of CO 2 . 4 moles of H 2 O and 1…
• The highest electrical conductivity of the following aqueous solutions is of:
• 5.6 litres of methane (CH 4 ) gas are ignited in oxygen gas. The number of moles of CO 2 formed is:
• The percentage of Fe 3 + ion present in Fe 0.93 O 1.00 is:
• 2 g of a base whose equiv. wt. is 40 reacts with 3 g of an acid. The equiv. wt. of the acid is:
• What is the molarity of 0.2 N Na 2 CO 3 solution?
• Match the following property. Column I Column II A Law of Multiple proportions (i) Richter B Law of Combining volumes…
• 0.56 g of a gas occupies 280 cm 3 at NTP, then its molecular mass is:
• The right option for the mass of CO 2 produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40) [ CaCO…
• With the exception of water, which one of the following is possibly the most important accessory chemical substance in…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• Assertion: Penicillin-G is not an antihistamine. Reason: Penicillin-G is effective against gram positive as well as…
• In which case upon mixing of a strong acid and a base each of 1N concentration, temperature increase observed to be the…
• One litre solution contains 1.72 g CaSO 4 .2H 2 O, 1.11 g CaCl 2 and 3.22 g of Na 2 SO 4 , 10H 2 O. If the metal ions…
• The weight of graphite that must be burnt to produce 13.2 g of CO 2 is:
• Assertion: COD measurement is used to determine the amount of organic matter present in the water. Reason: Potassium…
• An organic compound on analysis gave C = 42.8%, H = 7.2%, and N = 50%. Volume of 1 g of the compound was found to be…
• The weight of 1 x 10 22 molecules of CuSO 4 . 5H 2 O is:
• The average mass of air is 28.6 gm/22.4 L at STP. Its vapour density is:
• 10 g CaCO 3 on reaction with 1 litre of 0.1 M HCl acid will produce CO 2 :
• If 340 g of mixture of N 2 and H 2 in the correct ratio gave a 20% yield of NH 3 . The mass produced would be:
• Molarity of liquid HCl if density of solution is 1.17 g/cc:
• The concentration of C = 85.45% and H = 14.55% is not obeyed by the formula:
• Insulin contains 3.4% sulphur. What will be the minimum molecular weight of insulin?
• Two coherent light beams of intensity I and 4 I are superposed. The maximum and minimum possible intensities in the…
• Heat of neutralisation of a strong acid by a strong base is equal to ∆H of:
• The mass of Fe can be theoretically obtained by the reduction of 1 kg of Fe 2 O 3 is:
• The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is:
• Which of the following is not the main characteristic of LASER beam?
• The atomic masses of two elements A and B are 20 and 40 respectively. If x g of A contains y atoms. How many atoms are…
• Which fertilizer is responsible for the increment in the acidity of soil?

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