In the following redox reaction, what will be the sum of $x, y$, and $z$ ?
$$ \begin{aligned} x \mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q) & +y \mathrm{SO}_3^{2-}(a q)+z \mathrm{H}^{+}(a q) \longrightarrow \mathrm{Cr}^{3+}(a q)+\mathrm{SO}_4^{2-}(a q)+\mathrm{H}_2 \mathrm{O}(l) \end{aligned} $$
19
20
12
22
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that, 1 L bar $=100 \mathrm{~J}$ )
-30 J
-5 J
-30 kJ
-5 kJ
The freezing points of 0.01 M solutions of glucose, $\mathrm{NaNO}_3$, and $\mathrm{AlCl}_3$ would be
highest for glucose
same for all
lowest for $\mathrm{AlCl}_3$
highest for $\mathrm{NaNO}_3$
Among the following, the strongest nucleophile in aqueous medium is
$\mathrm{OH}^{-}$
$\mathrm{CN}^{-}$
$\mathrm{NH}_3$
$\mathrm{H}_2 \mathrm{O}$
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