COMEDK 2026 Afternoon Shift | Ionic Equilibrium Question 1 | Chemistry

At $30^{\circ} \mathrm{C}$ the solubility of $\mathrm{PbI}_2$ salt in 0.2 M KI solution will be $X$, if the solubility product of $\mathrm{PbI}_2$ at $30^{\circ} \mathrm{C}$ is $2.4 \times 10^{-8}$. Identify the value of $X$.

$4.8 \times 10^{-7} \mathrm{M}$

$6.0 \times 10^{-7} \mathrm{M}$

$2.4 \times 10^{-8} \mathrm{M}$

$3.0 \times 10^{-8} \mathrm{M}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

The ionisation constant of the weak acid HF whose concentration is 0.1 M is $3.5 \times 10^{-4}$ The Equilibrium constant value for the reaction $\mathrm{F}^{-}+\mathrm{H}_2 \mathrm{O} \leftrightharpoons \mathrm{HF}+\mathrm{OH}^{-}$is _________ and the pH of aqueous solution of the weak acid is __________ .

$\mathrm{K}_{\mathrm{eq}}=4.4 \times 10^{-11} \& \mathrm{pH}=4.25$

$\mathrm{K}_{\mathrm{eq}}=3.58 \times 10^{-11} \& \mathrm{pH}=4.19$

$\mathrm{K}_{\mathrm{eq}}=2.86 \times 10^{-11} \& \mathrm{pH}=3.23$

$\mathrm{K}_{\mathrm{eq}}=3.92 \times 10^{-10} \& \mathrm{pH}=4.07$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

Imagine an R - moiety of a pentapeptide molecule having one $-\mathrm{SH},-\mathrm{CONH}_2,-\mathrm{NH}_2$ groups each and two $-$COOH groups in the amino acids forming the pentapeptide. If the pH is maintained at 13.2, what would be the total number of negative charges on the pentapeptide?

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

What volume of $0.2 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}$ needs to be added to 100 ml of $0.4 \mathrm{M} \mathrm{CH}_3 \mathrm{COONa}$ solution to prepare a buffer of pH equal to 4.91 ? ( $\mathrm{pK}_{\mathrm{a}}$ of $\mathrm{CH}_3 \mathrm{COOH}$ is 4.76 )

282.6 ml

213.65 ml

101.41 ml

141.54 ml

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