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

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Question 1 of 10

Chemistry

1. In an irreversible reaction equilibrium is

1.Established quickly

2.Never established

3.Established slowly

4.Established when reaction stops

Question 1 of 10

Question 2 of 10

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

1.A

2.B

3.C

4.Both a and b

Question 2 of 10

Question 3 of 10

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

1.Temperature of the reaction is not changed

2.All of the above are observed

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. Which is true about the equilibrium state?

1.The forward reaction stops

2.The reverse reaction stops

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

4.Both forward and reverse reactions stop

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.dm³.mol⁻¹

3.mol².dm⁻⁶

4.No units

Question 5 of 10

Question 6 of 10

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

1.2A(g) + B(g) ⇌ 3AC (g)

2.H₂(g) + CO₂(g) ⇌ H₂O(g) + CO(g)

3.N₂(g) + O₂ ⇌ 2NO(g)

4.All of these

Question 6 of 10

Question 7 of 10

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

1.2NO₂(g) ⇌ N₂O₄(g)

2.PCl₅(g) ⇌ PCl₃(g) + Cl₅ (g)

3.2lCl (g) ⇌ l₂ (g) + Cl₂(g)

4.N₂(g) + 3H₂(g) ⇌ 2NO₃(g)

Question 7 of 10

Question 8 of 10

8. 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.H₂, I₂ and HI

4.HI only

Question 8 of 10

Question 9 of 10

9. Active mass means

1.Total mass of products

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

3.Total mass of reactants

4.Total mass of reactants and products

Question 9 of 10

Question 10 of 10

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

1.Forward and reverse reactions stop

2.Forward and reverse rates become equal

3.Reaction continues to occur in both the directions

4.Concentration of reactants and products stop changing

Question 10 of 10

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