Class 10 Practice Level 3 – Acids, Bases and Salts Set - 2

Total questions: 15

If the pKa of acetic acid is 4.76, what is the pH of a buffer solution containing 0.1M acetic acid and 0.2M sodium acetate?

Topic: pH and pKa Relationship

3.76

4.76

5.06

6.76

None

The solubility product (Ksp) of AgCI is $ \displaystyle 1.8\times {{10}^{{-10}}}.$ What is the solubility of AgCI in water?

Topic: Solubility Product

$ \displaystyle 1.3\times {{10}^{{-5}}}M$

$ \displaystyle 1.8\times {{10}^{{-5}}}M$

$ \displaystyle 2.7\times {{10}^{{-5}}}M$

$ \displaystyle 3.6\times {{10}^{{-5}}}M$

None

Which buffer system has the greatest buffer capacity?

Topic: Buffer Capacity

$ \displaystyle 0.\text{1 M C}{{\text{H}}_{\text{3}}}\text{COOH and }0.1\text{M C}{{\text{H}}_{\text{3}}}\text{COONa}$

$ \displaystyle 0.\text{1 M }{{\text{H}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{ and 0}\text{.1M NaHC}{{\text{O}}_{3}}$

$ \displaystyle 1.0\text{ M C}{{\text{H}}_{3}}\text{COOH and 1}\text{.0 M C}{{\text{H}}_{3}}\text{COONa}$

$ \displaystyle \text{0}\text{.5 M N}{{\text{H}}_{4}}\text{OH and 0}\text{.5 M N}{{\text{H}}_{4}}\text{CI}$

None

Calculate the volume of $ \displaystyle \text{0}\text{.5 M }{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}$ required to neutralize $ \displaystyle 25\text{ ml of 1}\text{.0 M NaOH}\text{.}$

Topic: Acid-Base Neutralization

$ \displaystyle \text{12}\text{.5 ml}$

$ \displaystyle \text{25 ml}$

$ \displaystyle \text{50 ml}$

$ \displaystyle \text{75 ml}$

None

During the titration of a weak acid with a strong base, the pH at the equivalence point will be:

Topic: Titration Curves

Less than 7

Equal to 7

Greater than 7

Cannot be determined

None

Which of the following salts, when dissolved in water, will produce a basic solution?

Topic: Hydrolysis Of Salts

$ \displaystyle \text{N}{{\text{H}}_{4}}\text{Cl}$

$ \displaystyle \text{N}{{\text{a}}_{2}}\text{C}{{\text{O}}_{3}}$

$ \displaystyle \text{KN}{{\text{O}}_{3}}$

$ \displaystyle \text{N}{{\text{a}}_{2}}\text{S}{{\text{O}}_{4}}$

None

Calculate the pH of a buffer solution made by mixing 50 ml of 0.1 $ \displaystyle \begin{array}{l}\text{M N}{{\text{H}}_{4}}\text{OH and 50 ml of} { 0}\text{.1 M N}{{\text{H}}_{4}}\text{Cl}\text{.(Kb for N}{{\text{H}}_{4}}\text{OH=1}\text{.8}\times \text{1}{{\text{0}}^{{-5}}})\end{array}$

Topic: Buffer pH Calculation

8.95

9.25

9.55

9.75

None

If the solubility of $ \displaystyle \text{A}{{\text{g}}_{2}}\text{S}{{\text{O}}_{4}}$ in pure water is $ \displaystyle S,$ what will be its solubility in a 0.1M $ \displaystyle \text{N}{{\text{a}}_{2}}\text{S}{{\text{O}}_{4}}$ solution?

Topic: Common ion Effect

$ \displaystyle {\text{S}}$

$ \displaystyle \frac{\text{S}}{2}$

$ \displaystyle \frac{\text{S}}{4}$

$ \displaystyle \frac{\text{S}}{{10}}$

None

Which of the following indicators would be best suited for a titration between a week base and a strong acid?

Topic: Acid-Base Indicators

Phenolphthalein

Methyl orange

Bromothymol blue

Litmus

None

10.

Calculate the degree of dissociation $ \displaystyle (\alpha )$ of a 0.001 M acetic acid solution if the $ \displaystyle {{K}_{a}}$ of acetic acid is $ \displaystyle 1.8\times {{10}^{{-5}}}.$

Topic: Dissociation of Acids

0.013

0.042

0.095

0.134

None

11.

Which of the following solutions would form an effective buffer at pH 4.76

Topic: Buffer Systems

$ \displaystyle 0.1\text{ M HCI and 0}\text{.1 M NaCI}$

$ \displaystyle \text{0}\text{.1M C}{{\text{H}}_{3}}\text{COOH and 0}\text{.1 M C}{{\text{H}}_{3}}\text{COONa}$

$ \displaystyle \text{0}\text{.1 M N}{{\text{H}}_{4}}\text{OH and 0}\text{.1 M N}{{\text{H}}_{4}}\text{CI }$

$ \displaystyle 0.1\text{ M NaOH and 0}\text{.1 M KCI}$

None

12.

Calculate the hydrolysis constant $ \displaystyle \text{(}{{\text{K}}_{h}})$ for the acetate ion if $ \displaystyle {{\text{K}}_{w}}\,\text{is }1.0\times {{10}^{{-14}}}$ $ \displaystyle {{{K}_{a}}}$ for acetic acid is $ \displaystyle 1.8\times {{10}^{{-5}}}$.

Topic: Hydrolysis Constant

$ \displaystyle 1.8\times {{10}^{{-9}}}$

$ \displaystyle 5.6\times {{10}^{{-10}}}$

$ \displaystyle 5.6\times {{10}^{{-12}}}$

$ \displaystyle 1.0\times {{10}^{{-14}}}$

None

13.

Identify the Lewis base in the reaction: $ \displaystyle B{{F}_{3}}+N{{H}_{3}}\to {{F}_{3}}B-N{{H}_{3}}.$

Topic: Lewis Acid And Bases

$ \displaystyle B{{F}_{3}}$

$ \displaystyle N{{H}_{3}}$

$ \displaystyle {{F}_{3}}B-N{{H}_{3}}$

Both $ \displaystyle B{{F}_{3}}$ and $ \displaystyle N{{H}_{3}}$

None

14.

Which titration curve would represent the titration of a weak base with a strong acid?

Topic: Titration Curves

A curve starting at a high pH and ending at a low pH

A curve starting at a low pH and ending at a high pH

A curve starting at pH 7 and ending at a higher pH

A curve starting at pH 7 and ending at a lower pH

None

15.

Which of the following salts will hydrolyze to form a basic solution?

Topic: Hydrolysis Of Salts

$ \displaystyle \text{NaCl}$

$ \displaystyle {{\text{K}}_{2}}\text{S}{{\text{O}}_{4}}$

$ \displaystyle \text{NaHC}{{\text{O}}_{3}}$

$ \displaystyle \text{N}{{\text{H}}_{4}}\text{N}{{\text{O}}_{5}}$

None

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Class 10 Practice Level 3 – Acids, Bases and Salts Set - 2

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