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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.

[Ni(CO)₄], tetracarbonyl nickel(O).

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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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78. Give two properties in which interstitial compounds differ from its elements.

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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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