Class 10 Practice Level 3 – Acids, Bases and Salts Set – 2 Leave a Comment / By anushka kumari / July 29, 2024 Class 10 Practice Level 3 – Acids, Bases and Salts Set - 2 Total questions: 15 1. 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 2. 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 3. 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 4. 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 5. 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 6. 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 7. 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 8. 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 9. 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 1 out of 15 Time's up
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