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Cr 2+ is strong reducing agent than Fe 2+ . Reason: d 4 → d 5 occurs in case of Cr 2+ to Cr 3+ . But d 6 → d 5 occurs in case of Fe 2+ to Fe 3+ . In a medium (like water) d 3 is more stable as compared to d 5 .

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The d-And-f-Block Elements

Short Answer Type

1. Silver atom has a completely filled d orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

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2. In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

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3. The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

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How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

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5. Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

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6.
Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Cr²⁺ is strong reducing agent than Fe²⁺.
Reason: d⁴ → d⁵ occurs in case of Cr²⁺ to Cr³⁺.

But d⁶ → d⁵ occurs in case of Fe²⁺ to Fe³⁺. In a medium (like water) d³ is more stable as compared to d⁵.