# PRACTICE QUESTIONS ON CHEMICAL EQUILIBRIUM.

QUESTION 1.

What is the effect of decreasing the temperature of an exothermic reaction in equilibrium state?

QUESTION 2.

What happens to the equilibrium position in a Haber process, when the pressure of the system is reduced?

QUESTION 3.

In the reaction:-

2NOCl <--> 2NO + Cl2

what is the effect of roving some of NO formed ?

QUESTION 4

Write the expression for the equilibrium constant for the reaction:-

3Fe(s) + 4H2O(g) –> Fe3O4(s) + 4H2(g)

QUESTION 5.

Calculate the value of K for the reaction:-

2SO3(g) + O2(g) –> 2SO3(g)

at a temperature of 1700K, given that [SO2] = 0.048M, [SO2] = 0.0284M and [O2] = 0.093M.

QUESTION 6.

At a given temperature, the equilibrium constants K = 6.5 and Q = 3.3, predict the direction of the reaction.

QUESTION 7.

Calculate the [ COCl ] in the equilibrium reaction

CO(g) + PCl5(g) –> PCl3(g) + COCl(g) give that [ CO ] = 0.24M, [ PCl5 ] = 0.082M and [ PCl3 ] = 0.047M and equilibrium constant is 5.2°C at a certain temperature.

QUESTION 8.

If the Kc of the reaction:

N2(g) + O2(g) –> 2NO(g) at 2000°C is 4.08×10^-², calculate the value of Kp for the reaction.

QUESTION 9.

Find the Kc for the reaction

NiSO4(s) + 6H2O(g) –> NiSO4.6H2O(s) at a temperature of 25°C .

QUESTION 10.

If the equilibrium constant K for the reaction:

N2(g) + O2(g) –> 2NO(g) at 2000°C is 4.2, calculate the value of the equilibrium constant for the reaction below:

NO(g) –> 1/2N2(g) + O2(g).

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Asor Christopher
February 16, 2021 11:40 pm

1. The forward reaction will be favoured
2. Pressure has no effect on the reaction
3. The forward reaction is favoured
4. K = [H2]⁴/[H2O]⁴
5. The question is wrong (It has double SO3)
6.
7. The question isn’t correct cause we were asked to find[PCL3] while it was given
8. Kp = 0.00408
9. 6H2O
10. 0.487

Callistus
February 18, 2021 5:17 am

We were asked to find (COCL) not (PCl3)

Godfrey chiemela
February 17, 2021 4:19 am

1. Favours the forward rxn
2. The side with the higher numbers of mole is favored
3. The equilibrium constant will turn to 1/kc
4.kc = [1] • [H2]^4/[1] • [H2O]^4
5. 30.72M^-1
6. The reaction tends to move to the right hand side
7. [COCl] = 6.899M
8. Kp = 2.159×10^-6
9.Kc = 1/[H2O]^6
10. 0.488

Iyawa Benedicta
February 17, 2021 5:55 am

1.favours the forward reaction.
2. The equilibrium will shift to the left.
3. Forward reaction is favoured
4. [H2]^4/[H2O]^4
5. Question is wrong(double SO3)
6. Equilibrium will shift to the right
7. Question is not correct.
8. 4.08×10^-2
9. 1/[H2O]6
10. 0.487

Mac
February 17, 2021 6:42 am

1. It shifts to the right
2. It shifts to the right
3.it shifts to the right
4.k=[H2]⁴/[H20]⁴
5. Incorrect question
6. It shifts to the right
7.{cocl2}=2.177M
8. Kp= 4.08×10*-2
9.kc= {H2O}*-6/ 4.32×10*-21
10. 0.488M

Ndubueze Godswill Chinecherem
February 17, 2021 2:46 pm

1. It Favour the backward reaction
2.
3.
4. Kc = [H2]4/[H2O]4
5. Incorrect
6. Shift to the Right
7. 1.475 M
8. 4.08 x 10^-2
9. 6H2O
0. 0.49

Ehiagwina Victory
February 18, 2021 3:12 am

1. The equilibrium position will shift to the right
2. When the pressure is reduced the equilibrium position will shift to the backward rxn.
3. If some of the NO is removed the forward rxn will be favored
4. Kc= [H2]^4/[H2O]^4
5. 30.716M^-1
6. Q<K therefore equilibrium position shifts to the right
7. 0.723M
8. 4.8×10^-2
9. 1/[H2O]^6
10. 2.049

Onyeonoro Olivia
February 18, 2021 6:06 am

1.forward reaction will be favored
2.o
3.forward reaction
4.H2^4/H2o^4
5.incorrect
6.incorrect
7.incorrect
8.0.00408
9.6H2o
10.0.487

Vicky_A
February 18, 2021 5:26 pm

1. It favors the forward rxn
2. It favors the backward rxn
3. It slows down rate of reaction
4. [H2]²/[H2O]⁴
5. 2.87
6. The direction of the reaction shifts to the right
7. 2.17M
8. 4.08×10^-²
9. [H20]^6 or 1/[H20]^6
10. 0.488

John
February 20, 2021 8:48 pm

1.it would favor the forward reaction

John
February 20, 2021 8:57 pm

2.the yield of hydrogen gas in the back ward reaction is favoured

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