An open ended mercury mnometer is used t...

An open ended mercury mnometer 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:
`2A(g)rarr3B(g)+2C(g)` ltbr. If pressure of Gas A decreases to 0.8 atm. Then:
(Assume temperature to be constant at 300K)

total pressure increased by 1.3 atm

total pressure increased by 0.3 atm

total pressure increased by 22.3 cm of Hg

difference in mercuty level is 228mm

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