1.

Statement I : Colour of nitrogen dioxide changes to colourless at low temperature Statement II : At low temperature Nitrogen tetroxide (N_(2)O_(4)) is formed which is colourless.

Answer»

Both the statements individually true and Statement II is the CORRECT explanation of Statement I.
Both the statements are individually true but Statement II is not correct explanation of Statement I.
Statement I is true but Statement II is false .
Statement I is false but Statement II is true .

Solution :`NO_(2)` EXISTS in EQUILIBRIUM with the COLOURLESS gas DINITROGEN tetroxide
`(N_(2)O_(4))` . At higher temperature of `NO_(2)` is favoured while at low temperature `N_(2)O_(4)` predominates.


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