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
Identify the incorrect statement from the following:
Carbon has the ability to form $p \pi-p \pi$ multiple bond with itself.
$\mathrm{ECl}_3(\mathrm{E}=\mathrm{B}$ and Al$)$ is a monomer when $\mathrm{E}=\mathrm{B}$ and a dimer when $\mathrm{E}=\mathrm{Al}$.
The order of catenation property of Group 14 elements is $\mathrm{C} \gg \mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}$.
Oxygen exhibits only -2 oxidation state.
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