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 :
Sulphide, $\mathrm{S}^{2-}$
Sulphate, $\mathrm{SO}_4^{2-}$
Acetate, $\mathrm{CH}_3 \mathrm{COO}^{-}$
Carbonate, $\mathrm{CO}_3^{2-}$
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?
2
4
6
10
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: $\frac{2.303 R T}{F}=0.059, \log 2=0.3010$ )
-0.109 V
0.035 V
-0.035 V
0.109 V
The calculated 'spin-only' magnetic moment $\mathrm{Ti}^{2+}\left(3 \mathrm{~d}^2\right)$ is :
5.92 BM
3.87 BM
2.84 BM
4.90 BM
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