2.5 ~mL of 2 5 M weak monoacidic base (K_ b =1 10^ -12 . at .25^ … - Vidyadip

MCQ

$2.5 \mathrm{~mL}$ of $\frac{2}{5} \mathrm{M}$ weak monoacidic base $\left(\mathrm{K}_{\mathrm{b}}=1 \times 10^{-12}\right.$ at $\left.25^{\circ} \mathrm{C}\right)$ is titrated with $\frac{2}{15} \mathrm{M} \mathrm{HCl}$ in water at $25^{\circ} \mathrm{C}$. The concentration of $\mathrm{H}^{+}$at equivalence point is $\left(\mathrm{K}_W=1 \times 10^{-14}\right.$ at $\left.25^0 \mathrm{C}\right)$

A
$3.7 \times 10^{-13} \mathrm{M}$
B
$3.2 \times 10^{-7} \mathrm{M}$
C
$3.2 \times 10^{-2} \mathrm{M}$
✓
$2.7 \times 10^{-2} \mathrm{M}$

✓

Answer

Correct option: D.

$2.7 \times 10^{-2} \mathrm{M}$

d
$\begin{aligned} & \mathrm{BOH}+\mathrm{HCl} \longrightarrow \mathrm{BCl}+\mathrm{H}_2 \mathrm{O} \\ & \text { C } \end{aligned}$

$\begin{aligned} & \mathrm{B}^{+}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{BOH}+\mathrm{H}^{+} \\ & C(1-h) \\ & \text { Ch } \quad \text { Ch } \\ & \end{aligned}$

Volume of $\mathrm{HCl}$ used $=\frac{2.5 \times \frac{2}{5}}{2 / 15}=7.5 \mathrm{ml}$

Concentration of Salt, $\mathrm{C}=\frac{2.5 \times \frac{2}{5}}{10}=0.1 \mathrm{M}$

$\therefore \frac{\mathrm{Ch}^2}{1-\mathrm{h}}=\frac{\mathrm{K}_\pi}{\mathrm{K}_{\mathrm{b}}}$

Solving $\mathrm{h}=0.27$

$\left[\mathrm{H}^{+}\right]=\mathrm{Ch}=0.1 \times 0.27=2.7 \times 10^{-2} \mathrm{M}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 6.2. Equilibrium - II (icon Equilibrium)→6.2. Equilibrium - II (icon Equilibrium) — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Polysubstitution is a major drawback in

$\Delta {H_f}\,({H_2}O) = X;$ Heat of neutralisation of $C{H_3}COOH$ and $NaOH$ will be

In which of the following pair, both the species are isoelectronic but the first one is large in size than the second?

$\begin{array}{*{20}{c}}
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - C = C{H_2} + {{(C{H_3})}_2}CHC{H_3}\xrightarrow[{273\,K}]{{HF}}{C_8}{H_{18}}(A)}
\end{array}$ Unknown $(A)$ in the above reaction is

What is the $pH$ value of $M\, H_2SO_4$ ?

At $25\,^oC$, the solubility product of $Mg(OH)_2$ is $1.0\times10^{-11}$. At which $pH$, will $Mg^{2+}$ ions start precipitating in the form of $Mg(OH)_2$ from a solution of $0.001\, M\, Mg^{2+}$ ions?

In above compounds, decreasing order of rate of electrophilic aromatic substitution will be ?

The ionzation potential of hydrogen atom is $13.6\, eV.$ The energy required to remove an electron from the $n = 2$ state of hydrogen atom is : ............ $\mathrm{eV}$

The percentage degree of hydrolysis of a salt of weak acid $(HA)$ and weak base $(BOH)$ in its $0.1\, M$ solution is found to be $10\%$. If the molarity of the solution is $0.05\, M$, the percentage hydrolysis of the salt should be ....... $\%$.

The correct $IUPAC$ name of $2-$ethyl$-3-$pentyne is :