1. The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is
A. 3
B. 2.7
C. 2
D. 1.5
✅ The correct answer is option B.
Chemical Equilibrium MCQs
3. If a buffer solution of higher pH than seven is to be made we use
A. Strong acid and strong base
B. Weak acid and strong base
C. Weak acid and strong base
D. Weak acid and its salt with the strong base
✅ The correct answer is option D.
4. Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH?
A. 0
B. 1
C. 2
D. Anyone
✅ The correct answer is option C.
5. AgCl dissolved with concentration (2×10-2) Ksp will be
A. 3.6 x 10-6
B. 3.6 x 10-5
C. 7.2 x 10-6
D. 4 x 10-4
✅ The correct answer is option D.
6. In which of the following equilibria will Kc and Kp have the same value?
A. PCI5 = PCI3 + Cl2
B. N2 + 3H2 = 2NH
C. 2CO + O2 = CO2
D. N2 + O2 = 2NO
✅ The correct answer is option D.
7. Which of the following will not change the concentration of ammonia at the equilibrium?
A. Increase of pressure
B. Increase of volume
C. Addition of catalyst
D. Decrease in temperature
✅ The correct answer is option C.
8. pH of an aqueous solution is 5.5. The hydroxyl ion concentration in the solution would be
A. 5.5
B. 8.5
C. 10-8.5
D. 10
✅ The correct answer is option C.
9. For a reaction involving only gases at 25°C, the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp?
A. Kc is generally greater than Kp
B. Kc is generally less than Kp
C. Kc is generally equal to Kp
D. Kc is equal to Kp if the total moles of reactants and products are equal
✅ The correct answer is option D.