Question

Which of the following equilibrium will shift left on increasing temperature.
`(i) " " H_(2)O(g) hArr +1//2 O_(2)(g)`
`(ii) " " CO_(2)(g) +C(s) hArr CO(g)`
`(iii) " " C(s, "diamond") hArr C(s, "graphite")`
A. Only (i)
B. Both (i) and (ii)
C. Only (iii)
D. None

Answer 1

Correct Answer - C
Out of diamond and graphite, at a given temperature graphite has lesser energy and the process `[Delta H^(@) ._(f) C ("graphite" )=0]`.
`C(s,"diamond") hArr C(s, "graphite")`
is an exothermic process. As such an increase in temperature shifts the equilibrium in the backward direction.