The solubility product of iron (III) hydroxide is 1.6 x 10−39. If X is the solubility of iron (III) hydroxide, then which one of the following expressions can be used to calculate X?

Ksp = 27X4

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254

Physical Chemistry MCQ with Answers

254) The solubility product of iron (III) hydroxide is 1.6 x 10⁻³⁹. If X is the solubility of iron (III) hydroxide, then which one of the following expressions can be used to calculate X?

K_sp = X⁴

K_sp = 9X⁴

K_sp = 27X³

K_sp = 27X⁴

Answer is:

K_sp = 27X⁴

Explanation:

The solubility product of a sparingly soluble salt at a given temperature maybe defined as the product of the molar concentration of its ions each raised to the power equal to its number of ions present in the equation representing the dissociation of one molecule of the salt.

Physical Chemistry MCQ with Answers

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255) pH of a buffer solution decreases by 0.02 units when 0.12 gm of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27^oC. The buffer capacity of the solution is:

0.1

0.4

Answer is:

0.4

256) 20 mL of 0.1M acetic acid is mixed with 50 mL of potassium acetate. K_a of acetic acid = 1.8 x 10⁻⁵ at 27^oC. Calculate concentration of potassium acetate, if pH of the mixture is 4.8:

0.1M

0.04M

0.4M

0.02M

Answer is:

0.04M

257) Fear or excitement, generally causes one to breathe rapidly and it results in the decrease of CO₂ concentration in blood. In what way will it change the pH of blood?

pH will increase

pH will decrease

No change

pH will adjust to 8

Answer is:

No change

Explanation:

Blood itself is a buffer solution, so a small change in CO₂ concentration will not affect its pH.

258) The pH at the equivalence point of a titration may differ from 7 because of:

The self ionisation of water

Hydrolysis of the salt formed

The indicator used

The concentration of the standard solution

Answer is:

Hydrolysis of the salt formed

Explanation:

Saly hydrolysis affects the pH of the solution.

Physical Chemistry MCQ with Answers

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254) The solubility product of iron (III) hydroxide is 1.6 x 10−39. If X is the solubility of iron (III) hydroxide, then which one of the following expressions can be used to calculate X?

Ksp = 27X4

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

255) pH of a buffer solution decreases by 0.02 units when 0.12 gm of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27oC. The buffer capacity of the solution is:

0.4

256) 20 mL of 0.1M acetic acid is mixed with 50 mL of potassium acetate. Ka of acetic acid = 1.8 x 10−5 at 27oC. Calculate concentration of potassium acetate, if pH of the mixture is 4.8:

0.04M

257) Fear or excitement, generally causes one to breathe rapidly and it results in the decrease of CO2 concentration in blood. In what way will it change the pH of blood?

No change

258) The pH at the equivalence point of a titration may differ from 7 because of:

Hydrolysis of the salt formed

Physical Chemistry MCQ with Answers

254) The solubility product of iron (III) hydroxide is 1.6 x 10⁻³⁹. If X is the solubility of iron (III) hydroxide, then which one of the following expressions can be used to calculate X?

K_sp = 27X⁴

255) pH of a buffer solution decreases by 0.02 units when 0.12 gm of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27^oC. The buffer capacity of the solution is:

256) 20 mL of 0.1M acetic acid is mixed with 50 mL of potassium acetate. K_a of acetic acid = 1.8 x 10⁻⁵ at 27^oC. Calculate concentration of potassium acetate, if pH of the mixture is 4.8:

257) Fear or excitement, generally causes one to breathe rapidly and it results in the decrease of CO₂ concentration in blood. In what way will it change the pH of blood?