CBSE Class 12 Chemistry The D Block Elements Worksheet

Official Class 12 Chemistry Worksheets: Unit 4 The d- and f-Block Elements

Review targeted practice sets for Class 12 Chemistry Unit 4 The d- and f-Block Elements. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.

Chapter-wise Practice Material: Unit 4 The d- and f-Block Elements

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d- BLOCK ELEMENTS
 
1 In which of the following pairs, both the ions are coloured in aqueous solutions?
(a) Sc3+, Ti
(b) Sc3+, Co2+
(c) Ni2+, Cu+
(d) Ni2+, Ti3+
[Atomic no of Sc = 21, Ti = 22, Ni = 28, Co = 27, Cu = 29]
 
2 Which of the following is most stable in aqueous solution?
(a) Mn2+
(b) Cr3+
(c) V3+
(d) Ti3+
 
3 Magnetic moment of 2.83 BM is given by which of the following ion?
(a) Ti3+
(b) Ni2+
(c) Cr3+
(d) Mn2+
 
4 KMnO4 is not acidified by HCl instead of H2SO4 because
(a) H2 SO4 is stronger acid than HCl
(b) HCl is oxidised to Cl2 by KMnO4
(c) H2SO4 is dibasic acid
(d) rate is faster in presence of H2SO4
 
5 Out of Mn2O7 V2O3, V2O5, CrO, Cr2O3, the basic oxides are
(a) Mn2O7, V2O3
(b) V2O3, V2O5
(c) V2O5, CrO
(d) V2O3 and CrO
 
6 The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following statement is correct?
(a) Cu(II) is more stable
(b) Cu(II) is less stable
(c) Cu(I) and Cu(II) are equally stable
(d) Stability of Cu(I) and Cu(II) depends on nature of copper salts
 
7 Which of the following compounds will be coloured in solid state?
(a) Ag2SO4
(b) CuF2
(c) ZnF2
(d) Cu2Cl2
 
8 Anomalous electronic configuration in the 3d series are of
(a) Cr and Fe
(b) Cu and Zn
(c) Fe and Cu
(d) Cr and Cu
 
9 Which of the following are d-block elements but not regarded as transition elements?
(a) Cu, Ag, Au
(b) Zn, Cd, Hg
(c) Fe, Co, Ni
(d) Ru, Rh, Pd
 
10 Transition elements form alloys easily because they have
(a) Same atomic number
(b) Same electronic configuration
(c) Nearly same atomic size
(d) None of the above
 
11 Electronic configuration of a transition element X in +3 oxidation state is [Ar] 3d5.What is its atomic number?
(a) 25   (b) 26   (c) 27   (d) 24
 
12 Lanthanide contraction is due to increase in
(a) Shielding by 4 f electrons
(b) Atomic number
(c) Effective nuclear charge
(d) Size of 4 f-orbital
 
13 A transition element that has no electron in the ns orbital belongs to the ____.
a) 1st transition series
b) 2nd transition series
c) 3rd transition series
d) 4th transition series
 
14 The highest oxidation state shown by the transition element in 5d series is ____.
a) +4
b) +5
c) +8
d) +7
 
15 Copper has a positive Cu2+/Cu reduction potential value because _________________ .
a) high enthalpy of ionization
b) low enthalpy of hydration
c) high enthalpy of hydration
d) option (A) and (B)
 
FILL IN THE BLANKS
 
1. Transition metals is associated with higher catalytic activity due to____________oxidation state.
 
2. There are ________ unpaired ‘d’ electrons in present Cr2+ ion.
 
3. Element in the 4d series that is not regarded a transition metal is ________.
 
4. Transition metal compounds impart characteristic color to the flame due to_______.
 
5. Element in the 3d series with highest oxidation state is_________.
 
6. Transition metals form complexes due to__________
 
7. Zr and Hf have similar sizes due to_________.
 
8. Os can show highest oxidation state of _______.
 
9. In _______elements the 4f orbitals are progressively filled.
 
10. Lanthanoid that is commonly used as analytical reagent is ______.
 
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CBSE Class 12 Chemistry The D Block Elements Worksheet 1

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Exam Preparation Worksheet for Class 12 Chemistry Unit 4 The d- and f-Block Elements

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