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A open ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Initially manometer shows no difference in mercury level in both column as shown in diagram.
After sparking the container, 'A' dissociates according to following reaction
$A (g) ⟶ B (g) + 3 C (g)$
If pressure of Gas "A" decreases to 0.9 atm, then (Assume temperature to be constant and is 300 K) the wrong statement is

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total pressure increases by 0.3 atm

total pressure increases by 22.3 cm of Hg

total pressure increases to 1.3 atm

difference in mercury level is 228 mm of Hg

answer is C.

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Detailed Solution

$\begin{array}{l} P_{T} = (1 + 3 \times) = 1 + 3 \times 0 .1 = 1 .3 atm \\ ΔP = 0 .2 atm or 76 \times 0 .3 cm of Hg \\ or 760 \times 0 .3 mm of Hg \end{array}$

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