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(i) Cr 2 O 7 2– + 3Sn 2+ + 14H + → 2Cr 3+ + 3Sn 4+ + 7H 2 O (ii) MnO 4 – + 5Fe 2– + 8H + → 5Fe 3+ + Mn 2+ + 4H 2 O

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The d-And-f-Block Elements

Short Answer Type

181.

Explain the following facts:
Transition metals form coloured complexes.

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182.

Give reasons:
Among transition metals, the highest oxidation state is exhibited in oxoanions of a metal.

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183.

Give reasons:
Ce⁴⁺ is used as an oxidising agent in volumetric analysis.

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184.

Give reasons:
Zn²⁺ salts are white while Cu²⁺ salts are blue.

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185.

Why La, Gd and Lu has low value of 3rd ionisation enthalpies?

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186. Why is cerium a good analytical reagent?

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187. Given below are the electrode potential values, E° for some of the first row of transition elements:
Elements V(23) Cr(24) Mn(25)Fe(26)Co(27)Ni(28) Cu(29)
E°_M²⁺/M(V) –1.18 – 0.91 – 0.44 – 0.28 –0.28 –0.25 +0.34
Explain the irregularities in these values on the basis of electronic structures of atoms.

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