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6.1. Equilibrium - 1 (chemical Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.1. Equilibrium - 1 (chemical Equilibrium)1 Mark
MCQ
The equilibrium constant for a reaction,

$A + B  \rightleftharpoons  C + D$ is $1 \times 10^{-2}$ at $298\, K$ and is

$2$ at $273\, K$. The chemical process resulting in the formation of $C$ and $D$ is

  • ✓
    exothermic
  • B
    endothermic
  • C
    unpredictable
  • D
    there is no relationship between $\Delta H$ and $K$
✓

Answer

Correct option: A.
exothermic
a
With increase in temperature from $273\, K$ to $298\, K$, the value of the equilibrium constant decreases from $2$ to $1 \times 10^{-2}$. Thus as the temperature increases, the equilibrium shifts to left. This is possible for an exothermic reaction.

Thus the process resulting in the formation of $C$ and $D$ is an exothermic reaction.

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