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The d-And-f-Block Elements

Short Answer Type

211.

Give Possible reason for the fact that the radii of Mn²⁺ ions of the first row transition metals. Ti²⁺ (Z = 22) to Cu²⁺ (Z = 29) decrease with increasing atomic number.

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212.

Explain the catalytic action of Fe(III) between the reaction of I^– and persulphate ion S₂O₈^2–.

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213. What is the reason of the greater tendency of transition metals to form complex compouds?

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214. Why the transition metals and their compounds are widely used as catalysts?

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215.

What can be inferred from the magnetic moment values of the following complex species?

Example	Magnetic Moment (BM)
K₄[Mn(CN)₆]	2.2
[Fe(H₂O)₆]²⁺	5.3
K₃ [Mn Cl₄]	5.9

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216. What are interstitial compounds? What are their main characteristics?

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217.

Explain the structures of dichromate and chromate ion.

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Long Answer Type

218. Both d-block and p-block elements exhibit variable oxidation state. Give reasons for the difference in there variations.

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Short Answer Type

219.

Why are transition metal fluorides ionic in nature, whereas bromides and chlorides are covalent in nature.

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220.
Why are the ionization enthalpies of 5d elements greater than those of 3d and 4d elements?

When we move downward in a particular group the atomic number is increased, consequently nuclear charge is also increased. Due to this reason 5d-elements have higher nuclear change than 3d and 4d elements, therefore, the outer electrons are attracted strongly by the nucleus in 5d elements. On the other hand, the shielding effect of 4f electrons is very poor due to lanthanide contraction in 5d elements, which further increases from 5d elements than 3s and 4d electrons, where no 4f electrons and lanthanide contraction is present.

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