Ionic Equilibrum - Physical Chemistry - Chemistry Previous Year Questions

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The pH of pure water at $80^{\circ} \mathrm{C}$ is

Assertion (A) $\mathrm{p} K_a$ of phenol is 4.19 and that of benzoic acid is 10 .

Reason (R) Phenoxide ion is stabilised by non-equivalent resonance structures whereas benzoate ion by two equivalent resonance structures.

The correct option among the following is

At 298 K the molar solubility of $\mathrm{Cd}(\mathrm{OH})_2$ in $0.1 \mathrm{M} \mathrm{KOH}_{\mathrm{OH}}$ solution is $x \times 10^{-y}$. The values of $x$ and $y$ are respectively.

(At $298 \mathrm{~K}, K_{s p}$ of $\mathrm{Cd}(\mathrm{OH})_2=2.5 \times 10^{-14}$ )

Which of the following does not form a buffer solution?

Match the given ionisation constant values with the corresponding acids.

$$\begin{array}{lll} \hline \text { A. } & \mathrm{HI} & \text { (i) } 3.2 \times 10^9 \\ \hline \text { B. } & \mathrm{HF} & \text { (ii) } 3.5 \times 10^{-4} \\ \hline \text { C. } & \mathrm{HCl} & \text { (iii) } 1.3 \times 10^6 \\ \hline \text { D. } & \mathrm{HBr} & \text { (iv) } 1.0 \times 10^9 \\ \hline \end{array}$$

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Calculate the molar solubility of calcium hydroxide $\mathrm{Ca}(\mathrm{OH})_2$ in 0.10 M NaOH solution. The ionic product of calcium hydroxide is $5.5 \times 10^{-6}$.

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Ammonia is a Lewis base because it is

How many of the following are diprotic acids? Citric acid, chromic acid, oxalic acid, pyrosulphuric acid, sulphurous acid

The pH of the solution, when

(i) sodium acetate is dissolved in water.

(ii) ammonium chloride is dissolved in water.

What is the pH of 10 L of a buffer solution containing $0.01 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}$ and $0.1 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}$ having $\mathrm{pK}_b$ of 5 ?

pH of 0.05 M aqueous solution of diethyl amine is 10 . The value of equilibrium constant is