1st Year Chemistry Chapter 7 Test07. chemical Kinetics

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

1. The activation energy for a reaction can be:
   1. Increased by increasing temprature
   2. Increased by decreasing temprature
   3. Decreased by increasing concentration of reactants
   4. None of these
2. In a graph of concentration vs. time, the slope of the curve represents:
   1. Activation energy
   2. Rate of reaction
   3. Temperature
   4. Pressure
3. The rate of reaction generally increases with:
   1. Increase in temperature
   2. Decrease in temperature
   3. Constant temperature
   4. Cooling
4. If the concentration of C changes from 0.0 to 0.38 mol dm⁻³ in 20 s, the rate of reaction is approximately:
   1. 0.38 mol dm⁻³ s⁻¹
   2. 0.45 mol dm⁻³ s⁻¹
   3. 0.20 mol dm⁻³ s⁻¹
   4. 0.019 mol dm⁻³ s⁻¹
5. Activation energy is represented by the symbol:
   1. Ea
   2. ∆H
   3. Ep
   4. Et
6. The rate equation Rate=k[CH₃Cl][Cl₂]½ represents:
   1. First order
   2. Second order
   3. Fractional order
   4. Third order
7. In the expression A→B, the rate can be written as:
   1. dx/dt = -d[A]/dt = +d[B]/dt
   2. dx/dt = -d[B]/dt
   3. dx/dt = +d[A]/dt
   4. None of these
8. The rate equation for 2NO₂+F₂→2NO₂F is:
   1. Rate=k[NO₂]²
   2. Rate=k[F₂]
   3. Rate=k[NO₂][F₂]
   4. Rate=k[NO₂F]
9. The reaction NO+O₃→NO₂+O₂ follows which order?
   1. First order
   2. Second order
   3. Third order
   4. Fractional order
10. For a first-order reaction, rate is proportional to:
    1. [A]²
    2. 1/[A]
    3. [A]⁰
    4. [A]¹