Subject

Chemistry

Class

ICSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsLong Answer Type

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41.

(i) Kc for the reaction SO subscript 2 space left parenthesis straight g right parenthesis end subscript space plus 1 half straight O subscript 2 left parenthesis straight g right parenthesis space leftwards harpoon with barb up above long dash space SO subscript 3 space left parenthesis straight g right parenthesis space is space 61.7 at 60oC. What is its unit? Calculate Kp for the reaction and write its unit.

(ii) What happens to the equilibrium in a reversible reaction if a catalyst is added to it?


straight i right parenthesis space Unit space equals space left square bracket mol divided by lit right square bracket to the power of negative 1 divided by 2 end exponent

increment straight n space equals space 1 minus 1 1 half space equals space minus 1 half
We space know space that comma

straight K subscript straight p space equals space straight K subscript straight c left parenthesis RT right parenthesis to the power of increment straight n end exponent

straight K subscript straight p space equals space 61.7 space straight x space left square bracket 0.0821 space straight x space left parenthesis 60 plus 273 right parenthesis right square bracket to the power of 1 divided by 2 end exponent
space equals space 11.797 space atm

ii) When a catalyst is added, the state of equilibrium is not distributed but equilibrium is attained quickly. This is because the catalyst increases the rate of forward and backward reaction to the same extent.
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