To measure the pressure exerted by a trapped gas A, an open ended mercury manometer is used. After sparking the gas A, it dissociates as, A(g) `to` B(g) + 3C(g). If the pressure of A decreases to 0.9 atm, then (assume temperature to be constant, 300K)

Options

A. total pressure increased to 1.3 atm
B. total pressure increased by 0.3 atm
C. difference in mercury level is 228 mm
D. Total pressure increased by 0.3 cm of Hg

Explanation

`{:(A_((g))to ,B_((g))+, 3C_((g))),(1,0,0),(1-x, x,3x):}`