1
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

Given, $\Delta G^{\circ}=-502 \mathrm{~kJ} \mathrm{~mol}^{-1}$ for the dissociation of ,

$\mathrm{Mg}(\mathrm{OH})_2(s) \rightleftharpoons \mathrm{Mg}^{2+}(a q)+2 \mathrm{OH}^{-}(a q)$ at 298 K . Find the $K_{\mathrm{sp}}$ value.

$(R=8314 \mathrm{~J} / \mathrm{mol} \cdot \mathrm{K})$

A

$1.2 \times 10^{-9}$

B

$7.9 \times 10^{-8}$

C

$4.1 \times 10^{-10}$

D

$2.6 \times 10^{-7}$

2
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

Which of the following is a water-soluble vitamin?

A

Vitamin A

B

Vitamin K

C

Vitamin C

D

Vitamin D

3
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

In a first-order reaction, the initial concentration of $A$ is $0.5 \mathrm{~mol} \mathrm{~L}^{-1}$. After 20 minutes, the concentration reduces to $0.4 \mathrm{~mol} \mathrm{~L}^{-1}$. The rate constant is (in $\mathrm{min}^{-1}$ ).

A

0.0051

B

0.0112

C

0.025

D

0.051

4
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

An unknown ester is hydrolysed to give ethanol as one of the products. Which chemical test can be used to confirm the identity of this alcohol?

A

2,4-DNP test

B

Tollen's test

C

lodoform test

D

Schiff's test

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