d- and f-Block Elements — Important Questions
ICSE · Class 12 · Chemistry
60 important questions from d- and f-Block Elements for ICSE Class 12 Chemistry, with answers. Includes multiple choice and true false questions.
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Important Questions from d- and f-Block Elements
The colour of CuSO₄ solution is:
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Blue
CuSO₄ solution is blue because Cu²⁺ (3d⁹) has one unpaired electron and one d-orbital vacancy. The d-d transition absorbs orange-red light, and the complementary colour (blue) is observed.
All d-block elements are transition elements.
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False
Zn, Cd, and Hg are d-block elements but are NOT transition elements because they have completely filled d¹⁰ orbitals in their ground state and in all their stable ions. Transition elements require incomplete d-orbitals in atom or ion.
Magnetic moment of an ion with 3 unpaired electrons is:
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√15 BM
μ = √(n(n+2)) BM. For n=3: μ = √(3×5) = √15 ≈ 3.87 BM. This corresponds to ions like Cr³⁺ (3d³).
Which of the following is used as a catalyst in the Haber process for synthesis of ammonia?
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Iron (Fe)
Iron is the catalyst in the Haber-Bosch process: N₂ + 3H₂ ⇌ 2NH₃ (450°C, 200 atm). Molybdenum (Mo) is used as a promoter. V₂O₅ is for the Contact process; Pt is for the Ostwald process.
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