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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?

Transition metal has availability of vacant d- orbital Due to which transition metal show variable oxidation state. Vanadium is transition metal and it easily changes from one oxidation state to another. It can form unstable intermediates in one oxidation state and then readily changes into products by acquiring another stable oxidation state and thus providing new path to reaction.

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