Question 1: Palette 1/23

AP-EAPCET 2025 MCQ

At $T(\mathrm{~K}) K_{\mathrm{sp}}$ of two ionic salts $M X_2$ and $M X$ is $5 \times 10^{-13}$ and $1.6 \times 10^{-11}$ respectively. The ratio of molar solubility of $M X_2$ and $M X$ is

A

12.5

B

1.25

C

6.25

D

7.50

Question 2: Palette 2/23

AP-EAPCET 2025 MCQ

The molar solubility of $\mathrm{PbI}_2$ in $0.2 \mathrm{MPb}\left(\mathrm{NO}_3\right)_2$ solution in terms of $K_{s p}$ (solubility product) is

A

$\left(\frac{K_{s p}}{0.2}\right)^{1 / 2}$

B

$\left(\frac{K_{s p}}{0.4}\right)^{1 / 4}$

C

$\left(\frac{K_{s p}}{0.8}\right)^{1 / 2}$

D

$\left(\frac{K_{s p}}{0.8}\right)^{1 / 3}$

Question 3: Palette 3/23

AP-EAPCET 2025 MCQ

The percentage of ionisation of 1 L of $x \mathrm{M}$ acetic acid is 4.242 and is called solution " $A$ ". The percentage of ionisation of 1 L of $y \mathrm{M}$ acetic acid is 3 and is called solution " $B$ ". Solution " $A$ " is mixed with solution " $B$ ". What is the concentration of acetic acid in the resultant solution? ( $K_{\mathrm{a}}$ of acetic acid $=1.8 \times 10^{-5}$ )

A

0.05 M

B

0.015 M

C

0.02 M

D

0.15 M

Question 4: Palette 4/23

AP-EAPCET 2025 MCQ

When 30 mL of $0.2 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}$ is added to 30 mL of $2 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}$ solution. If the pH of the buffer formed is 8.2, what is the $\mathrm{p} K_b$ of $\mathrm{NH}_4 \mathrm{OH}$ ?

A

5.8

B

7.2

C

6.8

D

4.8

Question 5: Palette 5/23

AP-EAPCET 2025 MCQ

At $25^{\circ} \mathrm{C}, K_a$ of formic acid is $1.8 \times 10^{-4}$. What is the $K_b$ of $\mathrm{HCOO}^{-}$?

A

$1.8 \times 10^{-10}$

B

$5.55 \times 10^{-4}$

C

$5.55 \times 10^{-11}$

D

$5.55 \times 10^{-12}$

Question 6: Palette 6/23

AP-EAPCET 2025 MCQ

At $25^{\circ} \mathrm{C}$, the percentage of ionisation of ' $x$ ' M acetic acid is 4.242 . What is the value of $x$ ? $\left(K_{\mathrm{a}}=1.8 \times 10^{-5}\right)$

A

0.05

B

0.04

C

0.02

D

0.01

Question 7: Palette 7/23

AP-EAPCET 2025 MCQ

At $25^{\circ} \mathrm{C}$, the percentage of ionisation of $x \mathrm{M}$ acetic acid is 4.242 . What is the pH of the acetic acid solution?

$ \begin{aligned} & (\log 4.242=0.6275) ;(\log 0.04242=-1.372) \\ & \left(K_{\mathrm{a}}=1.8 \times 10^{-5}\right) \end{aligned} $

A

3.37

B

1.70

C

1.37

D

2.37

Question 8: Palette 8/23

AP-EAPCET 2025 MCQ

At $T(\mathrm{~K})$, the solubility product of AgBr is $4 \times 10^{-13}$. What is its solubility in 0.1 M KBr solution?

A

$2 \times 10^{-6} \mathrm{M}$

B

$4 \times 10^{-10} \mathrm{M}$

C

$4 \times 10^{-12} \mathrm{M}$

D

$4 \times 10^{-14} \mathrm{M}$

Question 9: Palette 9/23

AP-EAPCET 2024 MCQ

At $27^{\circ} \mathrm{C}$, the degree of dissociation of $\mathrm{H} A$ (weak acid) in 0.5 M of its solution is $1 \%$. The concentrations of $\mathrm{H}_3 \mathrm{O}^{+}, A^{-}$and $\mathrm{H} A$ at equilibrium (in $\mathrm{mol} \mathrm{L}^{-1}$ ) are respectively.

A

$0.005,0.005,0.495$

B

$0.05,0.05,0.45$

C

$0.01,0.01,0.49$

D

$0.005,0.495,0.005$

Question 10: Palette 10/23

AP-EAPCET 2024 MCQ

100 mL of $0.1 \mathrm{M} \mathrm{H} A$ (weak acid) and 100 mL of 0.2 M $\mathrm{Na} A$ are mixed. What is the pH of resultant solution? ( $K_{\mathrm{a}}$ of $\mathrm{H} A$ is $10^{-5}: \log 2=0.3$ )

A

4.7

B

5.0

C

5.3

D

4.0

Question 11: Palette 11/23

AP-EAPCET 2024 MCQ

Which of the following when added to 20 mL of a 0.01 M solution of HCl would decrease its pH ?

A

20 mL of 0.02 M HCl

B

20 mL of 0.005 M HCl

C

20 mL of 0.01 M HCl

D

40 mL of 0.005 M HCl

Question 12: Palette 12/23

AP-EAPCET 2024 MCQ

The solubility of barium phosphate of molar mass ' $M$ ' $\mathrm{g} \mathrm{mol}^{-1}$ in water is $x \mathrm{~g}$ per 100 mL at 298 K . Its solubility product is $1.08 \times\left(\frac{x}{M}\right)^a \times(10)^b$. The values of $a$ and $b$ respectively are

A

7,5

B

5,7

C

5,5

D

7,7

Question 13: Palette 13/23

AP-EAPCET 2024 MCQ

At $T(\mathrm{~K})$, the solubility product of $A X$ is $10^{-10}$. What is the molar solubility of $A X$ in 0.1 MHX ?

A

$10^{-5}$

B

$10^{-10}$

C

$10^{-9}$

D

$10^{-8}$

Question 14: Palette 14/23

AP-EAPCET 2024 MCQ

Which of the following will make a basic buffer solution?

A

100 mL of $0.1 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}+100 \mathrm{~mL}$ of 0.1 M NaOH

B

100 mL of $0.1 \mathrm{M} \mathrm{HCl}+100 \mathrm{~mL}$ of 0.1 M NaOH

C

50 mL of $0.1 \mathrm{M} \mathrm{KOH}+25 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}$

D

100 mL of $0.1 \mathrm{M} \mathrm{HCl}+200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}$

Question 15: Palette 15/23

AP-EAPCET 2024 MCQ

At $27^{\circ} \mathrm{C}, 100 \mathrm{~mL}$ of 0.4 M HCl is mixed with 100 mL of 0.5 M NaOH solution. To the resultant solution, 800 mL of distilled water is added. What is the pH of final solution?

A

12

B

2

C

1.3

D

1.0

Question 16: Palette 16/23

AP-EAPCET 2024 MCQ

What is the conjugate base of chloric acid?

A

$\mathrm{ClO}_4^{-}$

B

$\mathrm{ClO}^{-}$

C

$\mathrm{ClO}_2^{-}$

D

$\mathrm{ClO}_3^{-}$

Question 17: Palette 17/23

AP-EAPCET 2022 MCQ

The pH of 0.01 N lime water is

A

13.09

B

10

C

12

D

9.8

Question 18: Palette 18/23

AP-EAPCET 2022 MCQ

Equal volumes of 0.5 N acetic acid and 0.5 N sodium acetate are mixed. What is the pH of resultant solution? ($\mathrm{p} K_a$ of acetic acid $=4.75$)

A

4.85

B

4.65

C

4.75

D

7.0

Question 19: Palette 19/23

AP-EAPCET 2021 MCQ

Match the following columns.

	Column I (Species)		Column II (Conjugate acid)
A.	NH$_3$	1.	H$_2$CO$_3$
B.	HCO$_3^-$	2.	H$_3$O$^+$
C.	H$_2$O	3.	NH$_4^+$
D.	HSO$_4^-$	4.	H$_2$SO$_4$

A

A - 3, B - 1, C - 2, D - 4

B

A - 1, B - 3, C - 2, D - 4

C

A - 3, B - 2, C - 1, D - 4

D

A - 3, B - 2, C - 4, D - 1

Question 20: Palette 20/23

AP-EAPCET 2021 MCQ

The pH of 0.1 M solution of acetic acid will be [degree of dissociation of acetic acid is 0.0132]

A

4.32

B

3.14

C

1.14

D

2.88

Question 21: Palette 21/23

AP-EAPCET 2021 MCQ

The solubility of $\operatorname{AgBr}(s)$, having solubility product $5 \times 10^{-10}$ in $0.2 \mathrm{~M} \mathrm{~NaBr}$ solution equals

A

$5 \times 10^{-10} \mathrm{~M}$

B

$25 \times 10^{-10} \mathrm{~M}$

C

$0.5 \mathrm{~M}$

D

$0.002 \mathrm{~M}$

Question 22: Palette 22/23

AP-EAPCET 2021 MCQ

Calculate the pOH of 0.10 M HCl solution.

A

13

B

1

C

7

D

14

Question 23: Palette 23/23

AP-EAPCET 2021 MCQ

Which among the following pairs is not an acidic buffer?

A

$\mathrm{HCOOH}$ and $\mathrm{HCOOK}$

B

$\mathrm{HClO}_4$ and $\mathrm{NaClO}_4$

C

$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}$ and $\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa}$

D

$\mathrm{HCN}$ and $\mathrm{KCN}$