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GS Set-1
Chemistry
Physical Chemistry
219

Physical Chemistry MCQ with Answers

219) 100 mL HCN of 0.1M is titrated with 100 mL 0.1M NaOH solution. At the neutral point, pH of this solution will be: (pK_a of HCN = 4.74)

8.72

6.5

5.74

Answer is:

8.72

Explanation:

pH = (1⁄2) x (pK_w + pK_a + pK_b)

Physical Chemistry MCQ with Answers

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220) The pH of blood is 7.4. If the buffer in blood is CO₂ and HCO₃⁻, then the ratio of conjugate base to acid (H₂CO₃) to maintain the pH of the blood will be:

8.5

11.25

Answer is:

11.25

Explanation:

[H⁺] = 10^−pH

221) 1 L of saturated solution of MgCl₂ is evaporated to dryness, due to which 20 mg of residue is left. What is the solubility product of MgCl₂ of that solution?

2 x 10⁻¹⁰

4.7 x 10⁻⁹

3.39 x 10⁻¹¹

5.32 x 10⁻¹²

Answer is:

3.39 x 10⁻¹¹

222) 10 mL of 0.2M acid is added to 250 mL of a buffer solution with pH = 6.34. The pH of the solution becomes 6.32. The buffer capacity of the solution is:

0.1

0.2

0.3

0.4

Answer is:

0.1

Explanation:

Buffer capacity = [H⁺] ⁄ change in pH

223) Heat of neutralisation when 200 mL of 0.1M HCl is mixed with 300 mL of 0.2M NaOH will be:

−57.1 kJ

−11.42 kJ

−1.142 kJ

−114.2 kJ

Answer is:

−1.142 kJ

Explanation:

Limiting reagent = HCl

Physical Chemistry MCQ with Answers

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219) 100 mL HCN of 0.1M is titrated with 100 mL 0.1M NaOH solution. At the neutral point, pH of this solution will be: (pKa of HCN = 4.74)

8.72

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

220) The pH of blood is 7.4. If the buffer in blood is CO2 and HCO3−, then the ratio of conjugate base to acid (H2CO3) to maintain the pH of the blood will be:

11.25

221) 1 L of saturated solution of MgCl2 is evaporated to dryness, due to which 20 mg of residue is left. What is the solubility product of MgCl2 of that solution?

3.39 x 10−11

222) 10 mL of 0.2M acid is added to 250 mL of a buffer solution with pH = 6.34. The pH of the solution becomes 6.32. The buffer capacity of the solution is:

0.1

223) Heat of neutralisation when 200 mL of 0.1M HCl is mixed with 300 mL of 0.2M NaOH will be:

−1.142 kJ

Physical Chemistry MCQ with Answers

219) 100 mL HCN of 0.1M is titrated with 100 mL 0.1M NaOH solution. At the neutral point, pH of this solution will be: (pK_a of HCN = 4.74)

220) The pH of blood is 7.4. If the buffer in blood is CO₂ and HCO₃⁻, then the ratio of conjugate base to acid (H₂CO₃) to maintain the pH of the blood will be:

221) 1 L of saturated solution of MgCl₂ is evaporated to dryness, due to which 20 mg of residue is left. What is the solubility product of MgCl₂ of that solution?

3.39 x 10⁻¹¹