Most of the compounds of transition metals are coloured in the solid or in solution states. This....

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Most of the compounds of transition metals are coloured in the solid or in solution states. This is unlike the compounds of \( \mathrm{s} \) and \( \mathrm{p} \) block elements which are usually colourless or in
\( \mathrm{P} \)
any case not strongly coloured Paramagnetism is a property associated with transition elements. Most of the transition metals and their compounds show good catalytic properties.
Which of the following is true?
(1) The platinum catalyst is used in Haber's process of ammonia.
(2) Nickel is used as a catalyst in the hydrogenation of olefins.
(3) Iron is used in the contact process as a catalyst.
(4) All are true.


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