1
MHT CET 2024 15th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Conjugate acid of $\mathrm{NH}_2^{-}$and $\mathrm{NH}_3$ are respectively

A
$\mathrm{NH}_4 \mathrm{OH}$ and $\mathrm{NH}_2 \mathrm{OH}$
B
$\mathrm{NH}_3$ and $\mathrm{NH}_2^{-}$
C
$\mathrm{NH}_3$ and $\mathrm{NH}_4{ }^{+}$
D
$\mathrm{NH}_4{ }^{+}$and $\mathrm{NH}_3$
2
MHT CET 2024 15th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A buffer solution is prepared by mixing $0.2 \mathrm{~M} \mathrm{~NH} \mathrm{O}_4 \mathrm{OH}$ and $1 \mathrm{~M} \mathrm{~NH}_4 \mathrm{Cl}$. What is the pH value of buffer solution? $\left(\right.$ Give $\left.\mathrm{pK}_{\mathrm{b}}=7.744\right)$

A
5.56
B
6.99
C
8.44
D
9.56
3
MHT CET 2024 15th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The dissociation constant of a weak monobasic acid is $3.2 \times 10^{-4}$. Calculate the degree of dissociation in its 0.04 M solution.

A
0.0128
B
0.0151
C
0.078
D
0.089
4
MHT CET 2024 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The solubility of $\mathrm{CaCO}_3$ is $7 \times 10^{-5} \mathrm{~mol} \mathrm{dm}^{-3}$ at $25^{\circ} \mathrm{C}$. What is its solubility product at same temperature?

A
$6.7 \times 10^{-9}$
B
$9.0 \times 10^{-9}$
C
$1.12 \times 10^{-9}$
D
$4.9 \times 10^{-9}$
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