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The d-And-f-Block Elements

Short Answer Type

131. In what way is the electronic configuration of the transition elements different from that of the non-transition elements?

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132. What is the reason for the high melting points of d-block elements?

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133. Explain giving reason:
Transition metals and many of their compounds show paramagnetic behaviour.

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134. Explain giving reason:
The enthalpies of atomisation of the transition metals are high.

Enthalpy of atomisation depend upon the number of unpaired electron more is unpaired electron more is enthalpy of atomisation.

The metallic bond is formed as a result of the interaction of electrons in the outermost shell. Greater the number of valence electrons, stronger is the metallic bond.

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135. Explain giving reason:
The transition metals generally form coloured compounds.

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136. Explain giving reason:
Transition metals and their many compounds act as good catalyst.

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Long Answer Type

137.

What are interstitial compounds? Why are such compounds well known for transition metals?

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138. How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.

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139.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

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Short Answer Type

140.

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
(a) iodide (b) iron (II) solution and (c) H₂S.

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