1st Year Chemistry Chapter 8 Test08. Chemical Equilibrium

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. A reversible reaction is one in which:
   1. Reactants completely convert into products
   2. Products cannot react further
   3. Products react to form reactants again
   4. Reaction occurs only in one direction
2. The oxidation of SO₂ to SO₃ is:
   1. Endothermic
   2. Exothermic
   3. Neutral
   4. Reversible only at high temperature
3. For the following reaction: 2A(g) ⇌ 3C(g) We can write:
   1. Kc > Kp
   2. Kc p
   3. Kp – Kc = 0
   4. Kp - Kc =-1
4. The suitable temperature for maximum SO₃ yield in contact process is:
   1. 200-250°C
   2. 400-450°C
   3. 450-500°C
   4. 600°C
5. Le Chatelier's principle states that when a system at equilibrium is disturbed, it:
   1. Stops reacting
   2. Shifts to reduce the effect of disturbance
   3. Increases temperature
   4. Changes into new compounds
6. The equilibrium constant (Kc) is equal to:
   1. kr / kf
   2. kf / kr
   3. kf × kr
   4. 1 / (kf × kr)
7. Macroscopic events are those which:
   1. Can be seen with naked eye
   2. Cannot be seen with naked eye
   3. Involve electrons only
   4. Are imaginary processes
8. An equilibrium system in which all reactants and products are in the same phase is called:
   1. Dynamic equilibrium
   2. Heterogeneous equilibrium
   3. Homogeneous equilibrium
   4. Static equilibrium
9. For a general reaction aA + bB ⇌ cC + dD, the equilibrium constant expression is:
   1. [A]^a [B]^b / [C]^c [D]^d
   2. [C]^c [D]^d / [A]^a [B]^b
   3. [A]^a / [C]^c
   4. [B]^b / [D]^d
10. Kc applies only at:
    1. Initial state
    2. Any condition
    3. Final state
    4. Equilibrium state