1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What volume of $$0.2 \mathrm{~M}$$ Acetic acid is to be added to $$100 \mathrm{ml}$$ of $$0.4 \mathrm{M}$$ Sodium acetate so that a Buffer solution of $$\mathrm{pH}$$ equal to 4.94 is obtained? $$(\mathrm{pK}_{\mathrm{a}}$$ of $$\mathrm{CH}_3 \mathrm{COOH}=4.76)$$

A
132.1 ml
B
125.3 ml
C
150.2 ml
D
110.6 ml
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{A}_3 \mathrm{~B}_4$$ is a sparingly soluble salt with a solubility of $$\mathrm{s} g / \mathrm{L}$$. If the Molar mass of $$\mathrm{A}_3 \mathrm{~B}_4$$ is $$\mathrm{Mg} / \mathrm{mol}$$, what is the expression for its $$\mathrm{K}_{\text {sp }}$$ ?

A
$$6912(\mathrm{~s} / \mathrm{M})^7$$
B
$$8413(\mathrm{~s} \mathrm{M})^8$$
C
$$5184(\mathrm{~s} / \mathrm{M})^7$$
D
$$5185(\mathrm{~s} \mathrm{M})^6$$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$300 \mathrm{ml}$$ of an aqueous solution of $$\mathrm{NaOH}$$ with $$\mathrm{pH}$$ value of 10 is mixed with $$200 \mathrm{ml}$$ of an aqueous solution of $$\mathrm{HCl}$$ with a $$\mathrm{pH}$$ value of 4. What will be the $$\mathrm{pH}$$ of the resultant solution at room temperature?

A
11.262
B
10.52
C
9.301
D
8.909
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a $$0.2 \mathrm{~M}$$ aqueous solution, lactic acid is $$6.9 \%$$ dissociated. The value of dissociation constant is

A
$$1.2 \times 10^{-4}$$
B
$$9.5 \times 10^{-4}$$
C
$$6.5 \times 10^{-4}$$
D
$$3.6 \times 10^{-2}$$
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