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A open ended mercury manometer is used ...

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 columns as shown in diagram.

After sparking 'A' dissociates according to following reaction
`A(g)rarrB(g)+3C(g)`
If pressure of Gas "A" dissociates to 0.9 atm, then (Assume temperature to be constant and is 300 K)

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