For the reactions `A+BhArr3C` at `25^(@)C`, a 3 litre vessel contains 1,2,4 mole of A, B and C respectively predict the direction of reaction if
a. `K_(c)` for the reaction is 10
b. `K_(c)` for the reaction is 15
c. `K_(c)` for the reaction is 10.66

Explanation

`A+B hArr 3C "at" 25^(@)C`
`Q_(C)=([C]^(3))/([A][B]) " " ` [C]=4/3 moles/lit
`=((4//3)^(3))/(1//3xx2//3) " " ` [A]=1/3 moles/lit
`=(64)/(6) " " ` [b]=2/3 moles/lit
`=10.66`
Given `K_(C)=10`
`K_(C) lt Q_(c)`
`:.` Backward reaction takes place