General
✓✗Which of the following is not a Lewis acid?
- C2H4
- FeCl3
- SiF4
- BF3
General
✓✗Which of the following compounds is electron-deficient?
- BCl3
- CCl4
- PCl5
- SiCl4
General
✓✗In which of the following equilibria are Kp and Kc not equal?
- CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
- 2BrCl(g) ⇌ Br2(g) + Cl2(g)
- PCl5(g) ⇌ PCl3(g) + Cl2(g)
- H2(g) + I2(g) ⇌ 2HI(g)
General
✓✗For NH4HS(s) ⇌ NH3(g) + H2S(g), the total pressure at equilibrium is 0.8 atm (only the solid was taken initially). The value of Kp is
- 0.8 atm2
- 0.64 atm2
- 0.4 atm2
- 0.16 atm2
General
✓✗A solution containing 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. The pKb of NH4OH is
- 8.25
- 3.75
- 4.75
- 9.25
General
✓✗Phenolphthalein is a suitable indicator for the titration of
- Na2CO3 with HCl to the second end point
- acetic acid with NaOH
- NH3 with HCl
- HCl with NH3
General
✓✗The equilibrium constant expression for Ag2O(s) ⇌ 2Ag(s) + ½O2(g) is
- Kp = 1/pO2
- Kp = pO2
- Kp = (pO2)1/2
- Kp = (pO2)2
General
✓✗The solubility of an MX2-type electrolyte is 0.5 × 10−4 mol L−1. Its Ksp is
- 5 × 10−12
- 5 × 10−13
- 25 × 10−10
- 1 × 10−13
General
✓✗Which of the following salts gives an acidic solution in water?
- CH3COONa
- CuSO4
- KNO3
- Na2CO3
General
✓✗For 2HI(g) ⇌ H2(g) + I2(g), the degree of dissociation of HI is α. The equilibrium constant is
- \( K = \dfrac{\alpha^2}{2(1-\alpha)} \)
- \( K = \dfrac{\alpha^2}{(1-\alpha)^2} \)
- \( K = \dfrac{\alpha^2}{4(1-\alpha)^2} \)
- \( K = \dfrac{\alpha}{2(1-\alpha)} \)
General
✓✗For N2O4(g) ⇌ 2NO2(g), the vapour density of the equilibrium mixture at a certain temperature is 38.33. The percentage dissociation of N2O4 is (molar mass of N2O4 = 92 g mol−1)
- 20%
- 10%
- 33%
- 40%
General
✓✗Which of the following is the strongest conjugate base?
- CH3COO−
- Cl−
- NO3−
- SO42−
General
✓✗For NH4HS(s) ⇌ NH3(g) + H2S(g), Kp = 0.09 atm2. Solid NH4HS is placed in a flask already containing NH3 at 0.5 atm. The partial pressure of H2S at equilibrium is about
- 0.30 atm
- 0.18 atm
- 0.14 atm
- 0.09 atm
General
✓✗Which of the following mixtures will make a basic buffer?
- 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH
- 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH
- 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH
- 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH
General
✓✗A saturated solution of H2S (0.1 M) has Ka1 = 1 × 10−7 and Ka2 = 1.3 × 10−13. If the solution is made 0.1 M in HCl, the [S2−] is about
- 1 × 10−8 M
- 1.3 × 10−21 M
- 1.3 × 10−19 M
- 1.3 × 10−13 M