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

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Question 1 of 10

Chemistry

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

1.Temperature of the reaction is not changed

2.Pressure or volume of the system is not changed

3.Concentration of any reactant or product is not changed

4.All of the above are observed

Question 1 of 10

Question 2 of 10

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

1.N₂(g) + O₂ ⇌ 2NO(g)

2.2A(g) + B(g) ⇌ 3AC (g)

3.H₂(g) + CO₂(g) ⇌ H₂O(g) + CO(g)

4.All of these

Question 2 of 10

Question 3 of 10

3. Which is true about the equilibrium state?

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

2.The reverse reaction stops

3.Both forward and reverse reactions stop

4.The forward reaction stops

Question 3 of 10

Question 4 of 10

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

1.mol².dm⁻⁶

2.dm³.mol⁻¹

3.mol.dm⁻³

4.No units

Question 4 of 10

Question 5 of 10

5. In an irreversible reaction equilibrium is

1.Established slowly

2.Established when reaction stops

3.Never established

4.Established quickly

Question 5 of 10

Question 6 of 10

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

1.Both a and b

2.B

3.A

4.C

Question 6 of 10

Question 7 of 10

7. Active mass means

1.Total mass of reactants and products

2.Total mass of reactants

3.Total mass of products

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

Question 7 of 10

Question 8 of 10

8. 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.Concentration of reactants and products stop changing

4.Reaction continues to occur in both the directions

Question 8 of 10

Question 9 of 10

9. 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.HI only

2.H₂ and I₂

3.H₂, I₂ and HI

4.H₂ only

Question 9 of 10

Question 10 of 10

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

1.PCl₅(g) ⇌ PCl₃(g) + Cl₅ (g)

2.N₂(g) + 3H₂(g) ⇌ 2NO₃(g)

3.2lCl (g) ⇌ l₂ (g) + Cl₂(g)

4.2NO₂(g) ⇌ N₂O₄(g)

Question 10 of 10

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