CBSE Class 12 Chemistry D And F Block Elements Question Bank Set A

Read and download free pdf of CBSE Class 12 Chemistry D And F Block Elements Question Bank Set A. Download printable Chemistry Class 12 Worksheets in pdf format, CBSE Class 12 Chemistry Unit 8 The d- and f-Block Elements Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Chemistry Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern

Unit 8 The d- and f-Block Elements Chemistry Worksheet for Class 12

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Class 12 Chemistry Unit 8 The d- and f-Block Elements Worksheet Pdf

Question. Sc (Z = 21) is a transition element but Zn (Z = 30) is not because
(a) both Sc3+ and Zn2+ ions are colourless and form white compounds
(b) in case of Sc, 3d orbitals are partially filled but in Zn these are filled
(c) last electron is assumed to be added to 4s level in case of Zn
(d) both Sc and Zn do not exhibit variable oxidation states 
Answer. B

Question. Which of the following ions has electronic configuration [Ar]3d6?
(a) Ni3+
(b) Mn3+
(c) Fe3+
(d) Co3+
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28) 
Answer. D

Question. Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is
[At. nos. Ti = 22, V = 23, Cr = 24, Mn = 25]
(a) Ti3+, V2+, Cr3+, Mn4+
(b) Ti+, V4+, Cr6+, Mn7+
(c) Ti4+, V3+, Cr2+, Mn3+
(d) Ti2+, V3+, Cr4+, Mn5+
Answer. D

Question. Which of the following configuration is correct for iron?
(a) 1s22s22p63s23p64s23d7
(b) 1s22s22p63s23p64s23d5
(c) 1s22s22p63s23p63d5
(d) 1s22s22p63s23p64s23d6
Answer. D

Question. Which of the following has more unpaird d-electrons?
(a) N3+
(b) Fe2+
(c) Zn+
(d) Cu+
Answer. B

Question. The electronic configuration of transition elements is exhibited by
(a) ns1
(b) ns2np5
(c) ns2 (n – 1)d1–10
(d) ns2 (n – 1)d10
Answer. C

Question. The electronic configurations of four elements are given below. Which element does not belong to the same family as others?
(a) [Xe]4f145d106s2
(b) [Kr]4d105s2
(c) [Ne]3s23p5
(d) [Ar]3d104s
Answer. C

Question. Identify the incorrect statement.
(a) Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
(b) The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
(c) Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
(d) The oxidation states of chromium in CrO4 2– and Cr2O7 2– are not the same. 
Answer. D

Question. The calculated spin only magnetic moment of Cr2+ ion is
(a) 3.87 BM
(b) 4.90 BM
(c) 5.92 BM
(d) 2.84 BM
Answer. B

Question. Match the metal ions given in Column-I with the spin magnetic moments of the ions given in Column-II and assign the correct code :
Column-I       Column-II
A. Co3+         (i) √8 B.M.
B. Cr3+         (ii) √35 B.M.
C. Fe3+         (iii) √3 B.M.
D. Ni2+         (iv) √24 B.M.
                     (v) √15 B.M.
      A   B   C   D
(a) (iv) (v) (ii) (i)
(b) (i) (ii) (iii) (iv)
(c) (iv) (i) (ii) (iii)
(d) (iii) (v) (i) (ii) 
Answer. A

Question. Magnetic moment 2.84 B.M. is given by
(At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)
(a) Cr2+
(b) Co2+
(c) Ni2+
(d) Ti3+
Answer. C

Question. Which of the following processes does not involve oxidation of iron?
(a) Formation of Fe(CO)5 from Fe.
(b) Liberation of H2 from steam by iron at high temperature.
(c) Rusting of iron sheets.
(d) Decolourisation of blue CuSO4 solution by iron. 
Answer. A

Question. Which of the following statements about the interstitial compounds is incorrect?
(a) They are much harder than the pure metal.
(b) They have higher melting points than the pure metal.
(c) They retain metallic conductivity.
(d) They are chemically reactive. 
Answer. D

Question. Identify the alloy containing a non-metal as a constituent in it.
(a) Invar
(b) Steel
(c) Bell metal
(d) Bronze 
Answer. B

Question. The catalytic activity of transition metals and their compounds is ascribed mainly to
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation states
(d) their chemical reactivity. 
Answer. C

Question. Which one of the following does not correctly represent the correct order of the property indicated against it?
(a) Ti < V < Cr < Mn; increasing number of oxidation states
(b) Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment
(c) Ti < V < Cr < Mn : increasing melting points
(d) Ti < V < Mn < Cr : increasing 2nd ionization enthalpy 
Answer. C

Question. Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E°M2+/M) value has a positive sign?
(a) Co (Z = 27)
(b) Ni (Z = 28)
(c) Cu (Z = 29)
(d) Fe (Z = 26)
Answer. C

Question. For the four successive transition elements (Cr, Mn,Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
(a) Mn > Fe > Cr > Co
(b) Fe > Mn > Co > Cr
(c) Co > Mn > Fe > Cr
(d) Cr > Mn > Co > Fe
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27) 
Answer. A

Question. Which of the following ions will exhibit colour in aqueous solutions?
(a) La3+ (Z = 57)
(b) Ti3+ (Z = 22)
(c) Lu3+ (Z = 71)
(d) Sc3+ (Z = 21)
Answer. B

Question. Which of the following pairs has the same size?
(a) Fe2+, Ni2+
(b) Zr4+, Ti4+
(c) Zr4+, Hf4+
(d) Zn2+, Hf4+ 
Answer. C

Question. Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
(a) 3d54s1
(b) 3d54s2
(c) 3d24s2
(d) 3d34s2 
Answer. B

Question. The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is
(a) Mn > Cr > Ti > V
(b) Ti > V > Cr > Mn
(c) Cr > Mn > V > Ti
(d) V > Mn > Cr > Ti
Answer. C

Question. In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29,Co = 27)
(a) Ni2+, Cu+
(b) Ni2+, Ti3+
(c) Sc3+, Ti3+
(d) Sc3+, Co2+ 
Answer. B

Question. Four successive members of the first row transition elements are listed below with their atomic numbers.Which one of them is expected to have the highest third ionisation enthalpy?
(a) Vanadium (Z = 23)
(b) Chromium (Z = 24)
(c) Manganese (Z = 25)
(d) Iron (Z = 26) 
Answer. C

Question. The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26,Ti = 22, Mn = 25)
(a) Sc3+
(b) Fe2+
(c) Ti3+
(d) Mn2+
Answer. A

Question. Which one of the following characteristics of the transition metals is associated with their catalytic activity?
(a) High enthalpy of atomization
(b) Paramagnetic behaviour
(c) Colour of hydrated ions
(d) Variable oxidation states
Answer. D

Question. The basic character of the transition metal monoxides follows the order
(Atomic no’s. Ti = 22, V = 23, Cr = 24, Fe = 26)
(a) VO > CrO > TiO > FeO
(b) CrO > VO > FeO > TiO
(c) TiO > FeO > VO > CrO
(d) TiO > VO > CrO > FeO
Answer. D

Question. Which of the following shows maximum number of oxidation states?
(a) Cr
(b) Fe
(c) Mn
(d) V 
Answer. C

Question. Which ion is colourless?
(a) Cr4+
(b) Sc3+
(c) Ti3+
(d) V3+ 
Answer. B

Question. Bell metal is an alloy of
(a) Cu + Zn
(b) Cu + Sn
(c) Cu + Pb
(d) Cu + Ni 
Answer. B

Question. In which of the following compounds transition metal has zero oxidation state?
(a) NOClO4
(b) NH2NH2
(c) CrO5
(d) [Fe(CO)5
Answer. D

Question. Which one of the following ionic species will impart colour to an aqueous solution?
(a) Zn2+
(b) Cu+
(c) Ti4+
(d) Cr3+
Answer. D

Question. A transition element X has a configuration [Ar]3d4 in its +3 oxidation state. Its atomic number is
(a) 22
(b) 19
(c) 25
(d) 26 
Answer. C

Question. Amongst TiF62–, CoF63–, Cu2Cl2 and NiCl42–, which are the colourless species? (Atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28)
(a) CoF63– and NiCl42–
(b) TiF62– and Cu2Cl2
(c) Cu2Cl2 and NiCl42–
(d) TiF62– and CoF63–
Answer. B

Question. The mercury is the only metal which is liquid at 0°C.
This is due to its
(a) high vapour pressure
(b) weak metallic bond
(c) high ionization energy
(d) both (b) and (c). 
Answer. D

Question. The manganate and permanganate ions are tetrahedral, due to
(a) the p-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
(b) the p-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
(c) there is no p-bonding
(d) the p-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese.
Answer. B

Question. When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is
(a) I2
(b) IO4
(c) IO3
(d) IO
Answer. C

Question. Which one of the following ions exhibits d-d transition and paramagnetism as well?
(a) CrO42–
(b) Cr2O72–
(c) MnO4
(d) MnO42– 
Answer. D

Question. Name the gas that can readily decolourise acidified KMnO4 solution.
(a) SO2
(b) NO2
(c) P2O5
(d) CO2
Answer. A

Question. Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?
(a) SO2 is reduced.
(b) Green Cr2(SO4)3 is formed.
(c) The solution turns blue.
(d) The solution is decolourised. 
Answer. B

Question. Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?
(a) FeSO3
(b) FeC2O4
(c) Fe(NO2)2
(d) FeSO
Answer. D

Question. The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives
(a) Mn4+ and O2
(b) Mn2+ and O2
(c) Mn2+ and O3
(d) Mn4+ and MnO2.
Answer. B

Question. Which of the statements is not true?
(a) On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
(b) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
(c) K2Cr2O7 solution in acidic medium is orange.
(d) K2Cr2O7 solution becomes yellow on increasing the pH beyond 7.
Answer. B

Question. Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
(a) Cr2(SO4)3
(b) CrO42–
(c) Cr2(SO3)3
(d) CrSO4
Answer. A

Question. The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
(a) one
(b) two
(c) five
(d) one fifth.
Answer. B

 

 
1. Zinc, cadmium and mercury are not considered as transition metals. Why? 
 
2. Write the general configuration of d- block elements. 
 
3. What is the ore of K2Cr2O7 and KMnO4
 
4. What is the effect of adding a base to potassium dichromate? 
 
5. The chemistry of actionoids is more complicated than lanthanoids. Why? 
 
6. What is the general valence configuration of f-block elements? 
 
7. Actionoid contraction is more than lanthanoid contraction. Give reason. 
 
8. Actionoids show larger number of oxidation states than lanthanoids. Why? 
 
9. Write the electronic configuration of Cr3+ ion (atomic number of Cr = 24)? 
 
10. Explain CuSO4. 5H2O is blue while ZnSO4 and CuSO4 are colourless? 
 
11. Why is the third ionisation energy of Manganese (Z = 25) is unexpectedly high?
 
12. Silver (Ag) has completely filled d-orbitals (4d10) in its ground state. How can you say that it is a transition element.
 
13. The +3 oxidation state of lanthanum (Z = 57), gadolinium (Z = 64) and lutetium (Z = 71) are especially stable. Why?
 
14. Mention one consequence of Lanthanoid Contraction?
 
15. The first ionization enthalpies of 5d– series elements is higher than those of 3d and 4d series elements why?
 
16. Why Mn2+ compounds are more stable than Fe2+ compounds towards oxidation to their +3 state?
 
17. What are interstitial compounds? 
 
18. Write the chemical equation for the reaction of thiosulphate ions andalkaline potassium permanganate.
 
19. Write the electronic configuration of Lu3+ (At. No. = 71) 
 
20. What is the most common oxidation state of actinoids? 
 
21. Why is Cd2+ ion white? 
 
22. Transition metals generally form coloured ions. Why? 
 
23. Which of the following will be colored?
 
Sc3+, V2+, Mn2+, Cu+, Ni2+.
 
24. Give an explanation for the catalytic properties shown by transition metals. 
 
25. Draw the structure of chromate and dichromate ions? 
 
26. Describe the steps of preparation of KMnO4
 
27. Draw the structure of manganate and permanganate ions? 
 
28. What is the composition of misch metal? Give its one use. 
 
29. What happens when
 
(a) A lanthonoid reacts with dil- acid
(b) A lanthonoid reacts with water.
 
30. Write the chemical equation, when the yellow colour of aqueous solution of Na2CrO4 changes to orange on passing CO2 gas?
 
31. The stability of Cu2+ (aq) is more than that of Cu+ (aq). Why? 
 
32. Write complete chemical equations for
(a) Oxidation of Fe2+ by Cr2O7 in acidic medium
(b) Oxidation of Mn2+ by MnO4 in neutral or faintly alkaline medium.
 
33. (a) Why do transition metals show high melting points?
(b) Out of Fe and Cu, which one would exhibit higher melting point?
 
34. Describe giving reason which one of the following pairs has the propertyindicated :
(a) Cr2+ or Fe2+ (stronger reducing agent).
(b) Co2+ or Ni2+ (lower magnetic moments).
 
35. Of the ions Co2+, Sc3+, Cr3+ which one will give colourless aqueous solution and how will each of them respond to magnetic field and why?
 
36. Account for the following :
(a) Copper shows its inability to liberate hydrogen gas from the diluteacids.
(b) Scandium (Z = 21) does not exhibit variable oxidation states.
 
37. The following two reactions of HNO3 with Zn are given.
(a) Zn + conc. HNO3 → Zn(NO3)2 + X + H2O
(b) Zn + dil.HNO3 → Zn(NO3)2 + Y + H2O
Identify X and Y and write balanced equations.
 
38. Account for the following :
(a) Transition metals and majority of their compounds act as goodcatalysts.
(b) From element to element, actionoid contraction is greater thanlanthanoidcontraction
 
39. Explain the steps of preparation of potassium dichromate?

 

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