Which one of the following characteristics of the transition metals is associated with their catalytic activity

Variable oxidation states

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High enthalpy of atomization

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Paramagnetic behaviour

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Colour of hydrated ions

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Solution

The correct option is A
Variable oxidation states

Variable oxidation states give free valencies.

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Q. Which one of the following characteristics of the transition metal is associated with their catalytic activity ?

Q. Most of the transition metals exhibit:
(i) paramagnetic behaviour
(ii) diamagnetic behaviour
(iii) variable oxidation states
(iv) formation of coloured ions

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following points:

(i) electronic configurations,

(ii) oxidation states,

(iii) ionisation enthalpies, and

(iv) atomic sizes.

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.

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Which one of the following characteristics of the transition metals is associated with their catalytic activity

The correct option is A Variable oxidation states Variable oxidation states give free valencies.

The correct option is A
Variable oxidation states

Variable oxidation states give free valencies.