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Q.
For equilibrium $ 2HI{{H}_{2}}+{{I}_{2}} $ . When $ {{H}_{2}} $ is added at constant temperature, the:
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Solution:
Increasing the concentration of products by adding $ {{H}_{2}} $ , causes the reaction to proceed in the reverse direction. Thus, addition of $ {{H}_{2}} $ , will decrease the dissociation of $ HI $ .