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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.

Oxygen is strong oxidising agent due to its high electronegtivity and smaller size.
because of these properties Oxygen are able to oxidise the metal to its highest oxidation state.
for example CrO₄^2- shows +6 oxidation state.

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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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