MCQs – d & f Block Elements SET 1

1. The general electronic configuration of d-block elements is:
a) (n−1)d¹–¹⁰ ns¹–²
b) ns² np⁶
c) ns² np⁵
d) (n−2)f¹–¹⁴ (n−1)d¹–¹⁰ ns²

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2. Which of the following elements shows maximum number of oxidation states?
a) Fe
b) Mn
c) Cr
d) V

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3. The transition metal that does not exhibit variable oxidation states is:
a) Sc
b) Cu
c) Mn
d) Fe

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4. Which ion is colourless?
a) Ti³⁺
b) V²⁺
c) Cu⁺
d) Cr³⁺

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5. The catalytic properties of transition metals are due to:
a) Variable oxidation states
b) High ionisation enthalpy
c) Low electronegativity
d) Inert pair effect

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6. Which of the following is a transition element?
a) Zn
b) Cd
c) Hg
d) Cu

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7. The lanthanoid contraction is due to:
a) Poor shielding of 4f electrons
b) High nuclear charge
c) Relativistic effects
d) d-orbital contraction

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8. The transition element used in stainless steel is:
a) Cr
b) Mn
c) Ni
d) Fe

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9. Which transition metal ion is most stable due to half-filled configuration?
a) Cr³⁺
b) Fe²⁺
c) Mn²⁺
d) Ni²⁺

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10. Which property is common to most transition metals?
a) They are colourless
b) They form coloured compounds
c) They are highly electropositive like alkali metals
d) They do not form complexes

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11. Potassium dichromate is a strong:
a) Reducing agent in acidic medium
b) Oxidising agent in acidic medium
c) Oxidising agent in basic medium
d) Neutral compound

Answer Key

1. a
2. b
3. a
4. c
5. a
6. d
7. a
8. a
9. c
10. b
11. b
12. b
13. c
14. d
15. b
16. b
17. a
18. b
19. c
20. d