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Consider the following equilibrium reaction: \(2AB_{{2}{(g)}...

Consider the following equilibrium reaction: 2AB2(g)+B2(g)2AB3(g). ΔH=XkJmol1. The backward reaction will be favored by

A.

a decrease in pressure

B.

an increase in pressure

C.

a decrease in temperature

D.

an introduction of a positive catalyst

Correct answer is A

The equilibrium position is shifted to the left with a decrease in pressure in this system because the number of gaseous molecules on the right is less. (Le-Chatelier's principle).