Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 7

Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 7

Q: 19. A sample of pure Equation was introduced into an evacuated vessel at 473 K. After equilibrium was attained, concentration of Equation was found to be Equation . If value of Equation is Equation , what are the concentrations of Equation at equilibrium?

Equation

Answer:

Let the concentration of both Equation . The given reaction is:

Equation

It is given that the value of equilibrium constant, Equation .

Now we can write the expression for equilibrium as:

Equation

Equation

Equation

Equation

Equation

Equation (Approximately)

Therefore, at equilibrium,

Equation .

Q: 20. One of the reactions that takes place in producing steel from iron ore is the reduction of iron (II) oxide by carbon monoxide to give iron metal and Equation

Equation

What are the equilibrium partial pressures of Equation and Equation at 1050 K if the initial partial

Pressures are: Equation

Answer:

For the given reaction,

Equation

Equation

Equation

Equation

It is given that Equation

Since Equation , the reaction will proceed in the backward direction.

Therefore, we can say that the pressure of CO will increase while the pressure of Equation will decrease

Now, let the increases in pressure of Equation in pressure of Equation be p. Then we can write,

Equation

Equation

Equation

Equation

Equation

Therefore, equilibrium partial of Equation

And, equilibrium partial pressure of Equation

Q: 21. Equilibrium constant, Equation for the reaction

Equation at 500 K is 0.061.

At a particular time, the analysis shows that composition of the reaction mixture is Equation . Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?

Answer:

The given reaction is:

Equation

Now, we know that,

Equation

Equation

Equation

It is given that Equation .

Since Equation the reaction is not at equilibrium.

Since Equation , the reaction will proceed in the forward direction to reach equilibrium.

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