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The brown gas prepared by the action of ...

The brown gas prepared by the action of concentrated nitric acid on copper is an equilibrium mixture of dinitrogen tetraoxide and nitrogen dioxide : `N_(2)O_(4(g))overset(Endothermic)(hArr)2NO_(2(g))`
Which one of the following changes would result in a darkening of the colour?

A

Increase in temperature

B

Increase in pressure

C

Addition of a catalyst

D

Removal of dinitrogen tetra oxide by liquefaction

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The correct Answer is:
A
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