Give reasons for the following:- Transition metals and many of their compounds act as catalyst.

Explain giving reason:- Transition metals and their many compounds act as good catalyst.

Give reason for the following. Sky in the moon appears dark.

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.

The transition metals are mostly

Account for the following:-Transition elements form a number of interstitial compounds.

Give reason for the following:- HF is liquid but HCI is gas.

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

Give reason for the following: Halogen act as good oxidising agent.

Give reasons for the following: Graphite is used as a lubricant in machines.