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1
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which from the following buffers is used for precipitation of cations of IIIA group in qualitative analysis?

A
$\mathrm{NH}_4 \mathrm{OH}$ and $\mathrm{NH}_4 \mathrm{Cl}$
B
$\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{CH}_3 \mathrm{COONa}$
C
$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}$ and $\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa}$
D

$$ \mathrm{HCOOH} \text { and } \mathrm{HCOONa} $$

2
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

The dissociation constant of weak monoacidic base is $1.8 \times 10^{-5}$. Calculate the degree of dissociation in 0.02 M solution.

A
0.03
B
0.04
C
0.02
D
0.01
3
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Calculate the pH of buffer solution containing 0.12 M weak acid and 0.48 M of its salt with strong base if $\mathrm{pK}_{\mathrm{a}}$ is 3.82 .

A
5.31
B
2.67
C
3.72
D
4.42
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which from the following equations represents the relation between solubility ( $\mathrm{mol} \mathrm{L}^{-1}$ ) and solubility product for the salt $\mathrm{B}_2 \mathrm{~A}$ ?

A
$\mathrm{S}=\left(\frac{\mathrm{K}_{\mathrm{sp}}}{4}\right)^{1 / 3}$
B
$\quad \mathrm{S}=\left(4 \mathrm{~K}_{\mathrm{sp}}\right)^{1 / 3}$
C
$\quad \mathrm{S}=\left(\frac{\mathrm{K}_{\mathrm{sp}}}{3}\right)^{1 / 3}$
D
$\quad \mathrm{S}=\left(3 \mathrm{~K}_{\mathrm{sp}}\right)^{1 / 3}$
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