Ncert Exercises & Solutions

The addition of a small amount of argon at a constant volume will not affect the equilibrium of the following reaction:

1.	H₂(g)+I₂(g)⇌2HI(g)
2.	PCl₅(g)⇌ PCl₃(g)+Cl₂(g)
3.	N₂(g)+3H₂(g)⇌2NH₃(g)
4.	The equilibrium will remain unaffected in all the three cases.

Hint: Inert gas doesn't affect equilibrium at constant volume according to Le - Chatelier's principle.

Explanation:

Step 1:

Le- Chatelier's principle, states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system in order to achieve a new equilibrium state.

The reaction is as follows:

H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)

{PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g)

Step 2:

According to Le chatelier's principle, the equilibrium constant (K) remains unaffected by the addition of inert gas in constant volume. Hence, in all three cases equilibrium remain unaffected.

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