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Question

At 1400 K, for the reaction CH4 (g)+2H2S (g)CS2 (g)+4H2 (g), Kc=2.5×103. A 10 L reaction vessel contains 2 moles of CH4, 3 moles of CS2 , 3 moles of H2 and 4 moles of H2S. Choose the correct statement from the following:

A
The information is insufficient to decide the direction of progress of reaction
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B
This reaction is at equilibrium with given concentrations.
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C
The reaction will proceed in backward direction
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D
The reaction will proceed in forward direction
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Solution

The correct option is C The reaction will proceed in backward direction
For the reaction,
QC=(nH2V)4(nCS2V)(nCH4V)(nH2SV)2

putting the values,
QC=(310)4(310)(210)(410)2=24332×102=7.59×102>Kc

So, reaction will proceed in backward direction.

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