1.

Which one of the following could be the melting point of iron ?

Answer»

`25^(@)C`
`37^(@)C`
`500^(@)C`
`1500^(@)C`

SOLUTION :It is because :
(i) the REACTION is endothermic and REQUIRES very high TEMPERATURE .
(ii) the reaction can be initiated only in presence of a catalyst .
(iii) oxides of nitrogen are unstable .
(iv) `N_(2)` and `O_(2)` are unreactive.


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