MCQ-11
For endothermic reaction, Ea is the activation energy in kJ/mol. The maximum value of enthalpy of reaction (∆H) will be
A. Less than Ea
B. More than Ea
C. Equal to Ea
D. Zero
Answer: A
MCQ-12
For which of the following reactions Kp > Kc
A. H2(g) + F2(g) ⇌ 2HF(g)
B. PCl5(g) ⇌ PCl3(g) + Cl2(g)
C. 2SO2(g) + O2(g) ⇌ 2SO3(g)
D. N2(g) +3H2(g) ⇌ 2NH3(g)
Answer: B
MCQ-13
A buffer is prepared by mixing the solutions of equimolar acetic acid and sodium acetate. The pH should be equal to
A. pKa of acid
B. Less than pKa of the acid
C. Number of moles of acid
D. More than pKa of the acid
Answer: A
MCQ-14
The difference in energy between reactants and the transition state is called
A. Enthalpy of reaction
B. Activation energy
C. Kinetic energy
D. Internal energy
Answer: B
MCQ-15
The mechanism below has been proposed for the reaction of CHCI3 with Cl₂
Step 1: Cl2 (g) ⇌ 2Cl(g)
Step 2: Cl(g) + CHCl3(g) → CCl3(g) + HCl(g)
Step 3: CCl3 + Cl(g) → CCl4 (g)
The rate law for the reaction is
A. Rate = [CHCl3] [Cl]2
B. Rate = [CCl3] [Cl]
C. Rate = [CHCl3] [Cl2]1/2
D. Rate = [Cl2]
Answer: C
