d- and f-Block Elements — practice questions

170 curated practice questions from d- and f-Block Elements (Chemistry JEE Main, NTA Exams) — 88 easy, 73 medium, 9 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

• Which of the following compounds is expected to be coloured ?
• Which of the following statements are correct about Zn, Cd and Hg? (A) They exhibit high enthalpy of atomization as the…
• The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is (Jee Main 2023)
• The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _____. Ti 2+ …
• Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect ?
• The most common and stable oxidation state of lanthanides is
• A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A)…
• Given below are two statements: Statement I: In the Lanthanoids, the formation of Ce 4+ is favoured by its noble gas…
• Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared…
• Which of the following factors may be regarded as the main cause of lanthanide contraction ?
• Intense blue precipitate of Fe 4 [Fe(CN) 6 ] 3 and potassium hydroxide solution when mixed gives :
• Which of the following oxides of chromium is amphoteric in nature ?
• Formation of coloured solution is possible when metal ion in the compound contains:
• Which of the following statements concerning lanthanide elements is false?
• Match the catalyst with the process : Catalyst Process (i) V _ 2 O _ 5 (p) The oxidation of ethyne to ethanal (ii) TiC1…
• Which one of the following characteristics of the transition metals is associated with their catalytic activity?
• Which of the following ions possesses the maximum number of unpaired electrons ?
• Which of the following elements have half-filled f-orbitals in their ground state? (Given: atomic number Sm =62 ; Bu…
• Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. Oxidies the iodide ion B. Oxidies…
• Which of the following ions is expected to be coloured in solution ?
• The covalent radii of transition metals decrease from left to right in a period because
• K _ 2 Cr _ 2 O _ 7 paper acidified with dilute H _ 2 SO _ 4 turns green when exposed to (Jee Main 2023)
• Given below are two statements: one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : […
• KMnO _ 4 oxidises in acidic and neutral/faintly alkaline solution, respectively to (Jee Main 2023)
• In 3d series, the metal having the highest M 2+ /M standard electrode potential is (JEE Main 2022)
• The general electronic configuration f-block elements is represented by
• Which one of the following exhibits the largest number of oxidation states?
• Number of moles of K 2 Cr 2 O 7 reduced by one mole of Sn 2+ ions is
• Which of the following elements shows the maximum number of different oxidation states in its compounds ?
• Which of the following is insoluble in dil. HNO 3 but dissolves in aquaregia ?
• The value of magnetic moment (spin only) for Cu 2+ in CuSO 4 .5H 2 O is
• Which one of the following ions does not give borax bead test?
• In context of the lanthanoids, which of the following statements is not correct ?
• Given below are two statements: Statement I: Fusion of MnO 2 with KOH and an oxidizing agent gives dark green K 2 MnO 4…
• Select the correct statement(s) for comparison of lanthanoids with actinoids.
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• Among the transition metals, the melting points of Zn, Cd and Hg are relatively low because
• When KMnO 4 acts as an oxidising agent and ultimately forms [MnO 4 ] 2– , MnO 2 Mn 2 O 3 , Mn +2 then the number of…
• Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to (Jee Main 2023)
• The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because
• Which one of the following oxides of chromium is amphoteric in nature ?
• The pair of lanthanides in which both elements have high third - ionization energy is: (Jee Main 2023)
• The hardness, melting point and boiling point of elements increase from Ce to Lu because
• The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are (JEE Main 2022)
• The general electronic configuration of group 12 elements is
• Given below are two statements: Statement I: Aqueous solution of K _ 2 Cr _ 2 O _ 7 is preferred as a primary standard…
• In alkaline medium. MuO _ 4 ^ - oxidises to (Jee Main 2024)
• Successive members of the first row transition elements are listed below with their atomic numbers. Which one of them…
• Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state…
• Which of the following species is/are paramagnetic? Fe 2 + , Zn 0 , Hg 2 + , Ti 4 +
• The correct order of basic nature of oxides of vanadium is (Jee Main 2023)
• Which of the following is not true about the transition elements ?
• To inhibit the growth of tumours, identify the compounds used from the following: (A) EDTA (B) Coordination Compounds…
• Which of the following statements is correct for the lanthanoids ?
• The highest possible oxidation state shown by osmium in its compounds is
• A transition element X has the configuration [Ar] d 4 , in its +3 oxidation state. Its atomic number is:
• Which of the following forms a colourless solution in aqueous medium?
• Choose the correct statements from the following. A. Mn 2 O 7 is an oil at room temperature. B. V 2 O 4 reacts with…
• Which of the following ions will exhibit colour in aqueous solutions?
• The element which shows only one oxidation state other than its elemental form is: (Jee Main 2024)
• Four successive members of the first series of the transition metals are listed below. For which one of them the…
• NaCl reacts with conc. H _ 2 SO _ 4 and K _ 2 Cr _ 2 O _ 7 to give reddish fumes (B), which react with NaOH to give…
• Given below are two statements: Statement I: Iron (III) catalyst, acidified K 2 Cr 2 O 7 and neutral KMnO 4 have the…
• Which of the following compounds has colour but no unpaired electrons?
• Strong reducing and oxidizing agents among the following, respectively, are (Jee Main 2023)
• The electronic configurations of the first four members of the actinide series cannot be written accurately in a…
• Choose the correct option having all the elements with d 10 electronic configuration from the following: (Jee Main 2024)
• Amount of oxalic acid present in a solution can be determined by its titration with KMnO 4 solution in the presence of…
• Given reaction is: 4 ~K _ 2 Cr _ 2 O _ 7 4 ~K _ 2 CrO _ 4 +3 O _ 2 + X In this reaction X is:
• The total number of Mn = O bonds in Mn 2 O 7 is ____. (JEE Main 2022)
• The first ionisation energies of the elements of the first transition series:
• Arrange Ce +3 , La +3 , Pm +3 and Yb +3 in increasing order of their ionic radii.
• The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives : (JEE Main 2022)
• Which of the following oxides of manganese is stable as well as basic ?
• Identify the statement which is not correct regarding CuSO 4 .
• In which of the following pairs, both the ions are coloured in aqueous solution? (At. no.:Sc = 21, Ti = 22, Ni = 28, Cu…
• Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: 5f…
• In chromite ore, the oxidation number of iron, and chromium are respectively?
• K _ 2 Cr _ 2 O _ 7 on heating with aqueous NaOH gives
• A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a…
• The reaction of H 2 O 2 with potassium permanganate in acidic medium leads to the formation of mainly: (JEE Main 2022)
• The mismatched combinations are A. Chlorophyll - Co B. Water hardness - EDTA C. Photography - [ Ag ( CN _ )_ 2 ]^ - …
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The metal ion(in gaseous state) with lowest spin-only magnetic moment value is (JEE Main 2022)
• A and B formed in the following reactions are: array l CrO _ 2 Cl _ 2 +4 NaOH ~A +2 NaCl +2 H _ 2 O ~A +2 HCl +2 H _ 2…
• When a mixture of solid NaCl and solid K 2 Cr 2 O 7 is heated with concentrated H 2 SO 4 , deep red vapours are…
• Which of the following compounds gives red precipitate with AgNO _ 3 ?
• CrO _ 4 ^ 2- reacts with H + as 2 CrO _ 4 ^ 2- +2 H ^ + Cr _ 2 O _ 7 ^ 2- + H _ 2 O The change in oxidation number of…
• In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are…
• Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being:
• Among the following, which is the strongest oxidizing agent? (JEE Main 2022)
• The transition metals sometimes form nonstoichiometric compounds. These compounds have
• The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complex is
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The number of element from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and Lu. (Jee Main 2024)
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: K 2 Cr 2 O…
• Which one of the following ionic species will impart colour to an aqueous solution ?
• Which of the following compounds show colour due to d-d transition? (Jee Main 2024)
• Which of the following arrangements does not represent the correct order of the property stated against it ?
• Given below are two statements: Statement I: The higher oxidation states are more stable down the group among…
• Highest oxidation state of Mn is exhibited in Mn _ 2 O _ 7 . The correct statements about Mn _ 2 O _ 7 are (A) Mn is…
• Which of the following is not formed when H 2 S reacts with acidic K 2 Cr 2 O 7 solution?
• Deep red-yellow vapour of CrO 2 Cl 2 is passed into an aqueous solution of NaOH. The solution turns
• The magnetic moment of a transition metal ion is found to be 5.92 B.M. The number of unpaired electrons present in it…
• When excess of hypo solution is added to copper sulphate, the final product formed is:
• For a given ion, the magnetic moment is 2.83 BM. The total spin (s) of all the unpaired electrons is
• The dark purple colour of KMnO 4 disappears in the titration with oxalic acid in acidic medium. The overall change in…
• Which of the following transition elements has completely filled d orbitals (the d 10 configuration)
• Which of the following ions has the maximum number of unpaired d electrons ?
• Fe(OH) 3 and Cr(OH) 3 precipitates can be completely separated by :
• Which of the following statements are correct? (A) The M ^ 3+ / M ^ 2+ reduction potential for iron is greater than…
• The 'f' orbitals are half and completely filled, respectively in lanthanide ions [Given: Atomic no. Eu, 63; Sm, 62; Tm…
• Which of the following transition metals does not show variable oxidation states ?
• Electronic configuration of Cu ( II ) is 3 d^ 9 whereas that of Cu ( D ) is 3 ~d ^ 10 . Which of the following is…
• Match List-I with List-II. List-I (Species) List-II (Electronic distribution) A. Cr +2 I. 3d 8 B. Mn + II. 3d 3 4s 1 C…
• Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in:
• In chromyl chloride test for confirmation of Cl – ion, a yellow solution is obtained. Acidification of the solution and…
• The transition metal having highest 3 rd ionisation enthalpy is: (Jee Main 2024)
• Which of the following statements concerning transition elements is false?
• The atomic and ionic radii (M 3+ ions) of lanthanide elements decrease with increasing atomic number. This effect is…
• In neutral or alkaline solution, MnO _ 4 ^ - oxidises thiosulphate to: (JEE Main 2022)
• In following pairs, the one in which both transition metal ions are colourless is: (JEE Main 2022)
• Which of the following 3d-metal ion will give the lowest enthalpy of hydration ( _ bdd H ) when dissolved in water ?…
• Consider the following equilibrium AgCl + 2NH 3 ⇌ [Ag (NH 3 ) 2 ] + + Cl – White precipitate of AgCl appears on adding…
• A solution of CrO _ 5 in amyl alcohol has a colour (Jee Main 2023)
• The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from…
• The maximum number of possible oxidation states of actinoids are shown by
• Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• The highest possible oxidation states of uranium and plutonium, respecitvely are:
• When small amount of SnCl 2 is added to a solution of Hg 2+ ions, a silky white precipitate is obtained. The silky…
• Which of the following compound is formed in borax bead test?
• Alkaline oxidative fusion of MnO 2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B…
• A metal nitrate reacts with KI solution to give yellow precipitate which on addition of excess of more concentrated…
• Ammonia forms the complex ion [Cu(NH 3 ) 4 ] 2+ with copper ions in alkaline solutions but not in acidic solutions…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is…
• Which of the following does not possess unpaired electrons ?
• Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of…
• The radius of La 3+ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Solution…
• The electronic configuration of chromium is actually [Ar]3d 5 4s 1 instead of normally expected [Ar]3d 4 4s 2 . This is…
• When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
• The set of correct statements is: (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and osmium…
• Corrosion of iron can be prevented by coating the surface with
• MnO _ 4 ^ - is prepared by treating a solution containing Mn 2+ ions with a very strong oxidizing agent such as
• The oxidation states shown by transition elements is related to their
• The general electronic configuration of the transition elements is
• Which of the following electronic configurations represents Fe 3+ ?
• Match List I with List II List I List II A. Cobalt catalyst I. ( H _ 2 + Cl _ 2 ) production B. Syngas II. Water gas…
• Which one of the following has maximum number of unpaired electrons?
• The atomic numbers of vandaium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26…
• Which of the following statements is incorrect for CrO 3 ?
• Acidified K 2 Cr 2 O 7 on treatment with KI produces
• In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, V : 23, Cr …
• Cr _ 2 O _ 7 ^ 2- reacts with OH – as Cr _ 2 O _ 7 ^ 2- +2 ( OH ^ - ) 2 CrO _ 4 ^ 2- + H _ 2 O The change in oxidation…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: E 0 for Mn…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The metal that shows highest and maximum number of oxidation state is: (Jee Main 2024)
• Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it? (JEE Main 2022)
• Which of the following acts as a strong reducing agent? (Atomic number: Ce = 58, Eu = 63, Gd = 64, Lu = 71). (Jee Main…
• What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid ?
• Na 2 CrO 4 on treatment with lead acetate gives a precipitate. This precipitate is dried and the solid is used as a…
• Metals generally melt at very high temperature. Amongst the following the metal with the highest melting point will be…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Solution…
• The electronic configuration of Pt (atomic number 78) is: (JEE Main 2022)
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The orange colour of K 2 Cr 2 O 7 and purple colour of KMnO 4 is due to (Jee Main 2024)
• Which one of the lanthanoids given below is the most stable in divalent form? (JEE Main 2022)
• In the general electronic configuration (n-2)^ -14 (n-1) d^ d-1 n 5^ 2 , if the value of n=7 the configuration will be…

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