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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.

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77. What is an alloy? Name the two types of alloy formed by transition elements. Give one example of a solid solution in relation to a smooth alloy.

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Interstitial compounds have modified properties than its elements e.g.

(i) They have high melting points, higher than those of pure metals.
(ii) They are very hard, some borides approach diamond in hardness.

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79. What is meant by disproportionation of an oxidation state? Give an example.

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80. Cu²⁺ is more stable than Cu⁺, Explain.

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