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At the same temperature, HCl gas and ${NH}_{3}$ gas are present in two vessels of same volume at a pressure of P atmospheres each. When one is jar inverted over the other so that the two will mix, after some time the pressure in the vessels will become.

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$\frac{p}{2}$

$\frac{p}{4}$

Zero

answer is C.

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Detailed Solution

${NH}_{3}$ and HCl are reacting gases. They can form solid ${NH}_{4} cl$ so pressure is zero. The chemical reaction is ${NH}_{3 (g)} + {HCl}_{g} \to {NH}_{4} {Cl}_{(s)}$

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