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    The correct answer is Option 1 only.

    Option 1

    High temperatures favour the forward endothermic process cause one mole of DinitroTetrafluoride to dissociate into two molecules which cause an increase in temperature hence pushing the right hand side mercury limb upwards.

    Option 2

    The Nitrogen in the right hand vessel sees its average KE increase so does the gas in the left hand vessel. They both exert a similar pressure hence no change in the mercury limb.

    Option 3

    I cant seem to eliminate this option. Why is it wrong ?

    I'd say 3 is wrong because if you heat up the gas then it'll expand, so it will push the mercury down.
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Updated: April 12, 2011

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