8 questions from 2024
Given below are two statements :Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities.Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by \( \mathrm{H_2CO_3} / \mathrm{HCO_3^\ominus} \) concentrations.In the light of the above statements, choose the correct answer from the options given below ;
The element which shows only one oxidation state other than its elemental form is:
\( K_a \) for \( \mathrm{CH_3COOH} \) is \( 1.8 \times 10^{-5} \) and \( K_b \) for \( \mathrm{NH_4OH} \) is \( 1.8 \times 10^{-5} \). The \( \mathrm{pH} \) of ammonium acetate solution will be ______.
The pH of an aqueous solution containing \( 1\,\mathrm{M} \) benzoic acid \( (\mathrm{p}K_a = 4.20) \) and \( 1\,\mathrm{M} \) sodium benzoate is \( 4.5 \). The volume of benzoic acid solution in \( 300 \, \mathrm{mL} \) of this buffer solution is ______ mL.(given: \( \log 2 = 0.3 \))
What will be the decreasing order of basic strength of the following conjugate bases ?
$\text{ }^{-}\text{OH}, \text{R}\bar{\text{O}}, \text{CH}_3\text{CO}\bar{\text{O}}, \text{C}\bar{\text{l}}$
The pH at which \( \text{Mg(OH)}_2 \) \( [K_{sp} = 1 \times 10^{-11}] \) begins to precipitate from a solution containing \( 0.10 \, \text{M} \) \( \text{Mg}^{2+} \) ions is ________.
For a sparingly soluble salt \( \mathrm{AB_2} \), the equilibrium concentrations of \( \mathrm{A^{2+}} \) ions and \( \mathrm{B^-} \) ions are \( 1.2 \times 10^{-4} \, \mathrm{M} \) and \( 0.24 \times 10^{-3} \, \mathrm{M} \), respectively. The solubility product of \( \mathrm{AB_2} \) is:
Given below are two statements :Statement (I) : Aqueous solution of ammonium carbonate is basic.Statement (II) : Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on \( K_a \) and \( K_b \) value of acid and the base forming it.In the light of the above statements, choose the most appropriate answer from the options given below :
