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.Reaction continues to occur in both the directions

2.Concentration of reactants and products stop changing

3.Forward and reverse rates become equal

4.Forward and reverse reactions stop

Question 1 of 10

Question 2 of 10

2. 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.All of these

4.N₂(g) + O₂ ⇌ 2NO(g)

Question 2 of 10

Question 3 of 10

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

1.Both a and b

2.A

3.B

4.C

Question 3 of 10

Question 4 of 10

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

1.All of the above are observed

2.Pressure or volume of the system is not changed

3.Concentration of any reactant or product is not changed

4.Temperature of the reaction is not changed

Question 4 of 10

Question 5 of 10

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

1.PCl₅(g) ⇌ PCl₃(g) + Cl₅ (g)

2.2lCl (g) ⇌ l₂ (g) + Cl₂(g)

3.N₂(g) + 3H₂(g) ⇌ 2NO₃(g)

4.2NO₂(g) ⇌ N₂O₄(g)

Question 5 of 10

Question 6 of 10

6. Which is true about the equilibrium state?

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

2.The forward reaction stops

3.Both forward and reverse reactions stop

4.The reverse reaction stops

Question 6 of 10

Question 7 of 10

7. In an irreversible reaction equilibrium is

1.Established slowly

2.Established when reaction stops

3.Established quickly

4.Never established

Question 7 of 10

Question 8 of 10

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

1.dm³.mol⁻¹

2.mol².dm⁻⁶

3.mol.dm⁻³

4.No units

Question 8 of 10

Question 9 of 10

9. 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 9 of 10

Question 10 of 10

10. 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, I₂ and HI

2.HI only

3.H₂ and I₂

4.H₂ only

Question 10 of 10

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