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Q.

Active mass is unity for 

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a

2 gms of gaseous hydrogen in 5 liter vessel

b

8 gms of gaseous oxygen in 10 liter vessel

c

16 gms of gaseous methane at STP

d

10 gms of solid CaCO3 in a liter vessel

answer is A.

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Detailed Solution

For solids, pure liquids active mass is always unity

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