Give two reactions in which transition metals or their compound acts as catalysts.

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Solution

Reactions in which transition metals or their compound acts as catalysts-
Haeber's process $\to$ It is the formation of ammonia from nitrogen and hydrogen using iron as the catalyst. This is a heterogeneous system.
${N_{2}}_{(g)} + 3 {H_{2}}_{(g)} F e - \to 2 {N H_{3}}_{(g)}$
Decomposition $\to$ Manganese dioxide catalyses the decomposition of hydrogen peroxide. This is a heterogeneous system.
$2 {H_{2} O_{2}}_{(l)} M n O_{2} - --- \to 2 {H_{2} O}_{(l)} + {O_{2}}_{(g)}$

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Explain giving reasons :
Transition metals and many of their compounds show paramagnetic behaviour.

The enthalpies of atomisation of the transition metals are high.

The transition metals generally form coloured compounds.

Transition metals and their many compounds act as good catalyst.

Explain giving reasons:

(i) Transition metals and many of their compounds show paramagnetic

behaviour.

(ii) The enthalpies of atomisation of the transition metals are high.

(iii) The transition metals generally form coloured compounds.

(iv) Transition metals and their many compounds act as good catalyst.

Z r (Z = 40)

H f (Z = 72)

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