Punjab 10th Class Chemistry Chapter 1 Chemical Equilibrium Punjab Boards 10th Class

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Question 1 of 10

Chemistry

1. Which of the following does not happen, when a system is at equilibrium state?

1.Forward and reverse reactions stop

2.Concentration of reactants and products stop changing

3.Reaction continues to occur in both the directions

4.Forward and reverse rates become equal

Question 1 of 10

Question 2 of 10

2. For which reaction, Kc has units of mol.dm⁻³.

1.PCl₅(g) ⇌ PCl₃(g) + Cl₅ (g)

2.N₂(g) + 3H₂(g) ⇌ 2NO₃(g)

3.2NO₂(g) ⇌ N₂O₄(g)

4.2lCl (g) ⇌ l₂ (g) + Cl₂(g)

Question 2 of 10

Question 3 of 10

3. Concentration of reactants and products at equilibrium remains unchanged if:

1.All of the above are observed

2.Temperature of the reaction is not changed

3.Pressure or volume of the system is not changed

4.Concentration of any reactant or product is not changed

Question 3 of 10

Question 4 of 10

4. When a mixture of H₂ and I₂ is sealed in a flask and temperature is kept at 20°C, following equilibrium is established.

H₂_(g) + I₂_(g) ⇌ 2HI_(g)

Which substance or substances will be present in the equilibrium mixture?

1.H₂ and I₂

2.H₂ only

3.HI only

4.H₂, I₂ and HI

Question 4 of 10

Question 5 of 10

5. What are the units for N₂(g) + O₂(g) ⇌ 2NO₂(g)

1.mol.dm⁻³

2.No units

3.dm³.mol⁻¹

4.mol².dm⁻⁶

Question 5 of 10

Question 6 of 10

6. Active mass means

1.Mass of substance in moles per dm³ in a dilute solution

2.Total mass of reactants

3.Total mass of products

4.Total mass of reactants and products

Question 6 of 10

Question 7 of 10

7. For a reversible reaction
Kc = [C]²/[A][B]
Which substance is product of the reaction?

1.C

2.Both a and b

3.A

4.B

Question 7 of 10

Question 8 of 10

8. In an irreversible reaction equilibrium is

1.Established quickly

2.Established slowly

3.Never established

4.Established when reaction stops

Question 8 of 10

Question 9 of 10

9. Which of the following reaction will not have any units for Kc?

1.All of these

2.2A(g) + B(g) ⇌ 3AC (g)

3.H₂(g) + CO₂(g) ⇌ H₂O(g) + CO(g)

4.N₂(g) + O₂ ⇌ 2NO(g)

Question 9 of 10

Question 10 of 10

10. Which is true about the equilibrium state?

1.Both forward and reverse reactions stop

2.The forward reaction stops

3.Both forward and reverse reactions continue at the same rate

4.The reverse reaction stops

Question 10 of 10

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