1
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

In a test tube containing a salt, a few drops of dilute $\mathrm{H}_2 \mathrm{SO}_4$ was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red.

Identify the correct anion from the following :

A

Sulphide, $\mathrm{S}^{2-}$

B

Sulphate, $\mathrm{SO}_4^{2-}$

C

Acetate, $\mathrm{CH}_3 \mathrm{COO}^{-}$

D

Carbonate, $\mathrm{CO}_3^{2-}$

2
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

At 298 K , a certain buffer solution contains equal concentrations of $\mathrm{X}^{-}$and $\mathrm{HX}, \mathrm{K}_{\mathrm{b}}$ for $\mathrm{X}^{-}$is $10^{-10}$. What is the pH of this buffer solution?

A

2

B

4

C

6

D

10

3
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

Calculate emf of the half cell given below :

$$ \begin{aligned} & \mathrm{Pt}(\mathrm{~s})\left|\mathrm{H}_2(\mathrm{~g}, 2 \mathrm{~atm})\right| \mathrm{HCl}(\mathrm{aq}, 0.02 \mathrm{M}) \\ & \mathrm{E}_{\mathrm{H}_2 / \mathrm{H}^{+}}^{\circ}=0 \mathrm{~V} \end{aligned} $$

(Given: $\frac{2.303 R T}{F}=0.059, \log 2=0.3010$ )

A

-0.109 V

B

0.035 V

C

-0.035 V

D

0.109 V

4
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

The calculated 'spin-only' magnetic moment $\mathrm{Ti}^{2+}\left(3 \mathrm{~d}^2\right)$ is :

A

5.92 BM

B

3.87 BM

C

2.84 BM

D

4.90 BM