Question

Consider the reaction :
`{:(,P(g)+,2Q(g)overset(K_(C )=10^(12))hArr,R(g)+,S(g)),("Initial conc.",2M,4M,0,0):}`
then select correct statement(s)
A. At equilibrium `[R(g)]=[S(g)]~=2M`
B. At equilibrium `[P(g)]=[Q(g)]~=10^(-4)M`
C. At equilibrium `[P(g)]~=10^(-4)M`
D. At equilibrium `[Q(g)]~=2xx10^(-4)M`

Answer 1

Correct Answer - A::C::D
Consider the reaction ……………
`{:(,P(g)+,2Q(g)hArr,R(g)+S(g),K_(c )=10^(12)),("Initial conc.", 2M,4M,0,0),("at equilibrium", x,2x,2M,2M),("conc.", ,(xrarr0), ,"Since"K_(c )"it very large"):}`
reaction will almost take place to completion.
`K_(c )=10^(12) = ((2)(2))/(x(2x)^(2)) implies x = 10^(-4)M`
`[P(g)]_(eq) = 10^(4)M`
`[Q(g)]_(eq)=2xx10^(-4)M`
`[R(g)]=[S(g)=2M`