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The d-And-f-Block Elements

Short Answer Type

71.

Why is copper sulphate pentahydrate coloured?

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72. Transition metals usually form coloured ions, why?

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73. Zn, Cd, Hg compounds are usually white. Explain.

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74. Give one example of any compound in which the oxidation state of Ni is zero.

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75. Why does V₂O₅ act as catalyst?

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76. Transition metals form a large number of interstitial compounds. Explain.

Transition metal have closed packed (CCP, HCP) lattice that have N holes. Small non-metallic atoms (e.g. H, B, C, N, etc.) are able to fit in the interstitial sites of transition metal lattice to form interstitial compounds. These are non-stoichiometric compounds.

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