Chemical Kinetics

Q1.For the decomposition of azoisopropane at 543 K, the data is: t = 0, P = 35 mmHg; t = 360 s, P = 54 mmHg. For A(g) → B(g) + C(g), the rate constant is approximately:

• A2.175 × 10⁻³ s⁻¹
• B2.175 × 10⁻² s⁻¹
• C4.35 × 10⁻³ s⁻¹
• D1.09 × 10⁻³ s⁻¹

Q2.The instantaneous rate of a reaction at time t is determined graphically by:

• AArea under the concentration-time curve
• BSlope of the secant to the concentration-time curve
• CSlope of the tangent to the concentration-time curve at time t
• DIntercept of the concentration-time curve

Q3.A first order reaction has a rate constant k = 5.5 × 10⁻¹⁴ s⁻¹. The half-life of this reaction is approximately:

• A1.26 × 10¹³ s
• B5.5 × 10¹⁴ s
• C8.0 × 10¹⁴ s
• D3.81 × 10¹³ s

Q4.For the reaction 2HI(g) → H₂(g) + I₂(g), if the rate of disappearance of HI is 0.04 mol L⁻¹ s⁻¹, the rate of formation of H₂ is:

• A0.04 mol L⁻¹ s⁻¹
• B0.08 mol L⁻¹ s⁻¹
• C0.02 mol L⁻¹ s⁻¹
• D0.01 mol L⁻¹ s⁻¹

Q5.Which plot gives a straight line for a first order reaction?

• A[R] vs t
• Bln[R] vs t
• C1/[R] vs t
• D[R]² vs t