d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 48

Question 236

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Why are Mn²⁺ compounds generally more stable than Fe²⁺ compounds towards oxidation to the +3 state?

Fe²⁺ has a more stable electron configuration.
The atomic size of Mn is larger.
The half-filled d orbital in Mn²⁺ (3d⁵) provides extra stability.
Mn has a lower electronegativity.

Question 237

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What is the electronic configuration of Cr³⁺?

[Ar] 3d⁵
[Ar] 3d³
[Ar] 4s¹ 3d⁵
[Ar] 3d⁴ 4s²

Question 238

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What is the primary role of the copper co-catalyst often used with PdCl2 in the Wacker process?

To directly oxidize ethylene
To act as the main catalyst
To facilitate the regeneration of the active Pd(II) catalyst
To provide chloride ions

Question 239

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What is the main factor that determines the color observed in a solution of a transition metal complex?

The color of the metal atoms
Reflection of all wavelengths
The specific wavelengths of light absorbed by d-d transitions
Emission of light from the complex

Question 240

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How does the reactivity of first series transition metals with water generally compare (excluding copper)?

They are completely inert
They react easily, producing hydrogen gas and metal hydroxides
They only react with steam
They form passive oxide layers