Which of the following species acts as an oxidising agent during working of hydrogenoxygen fuel cell?
$\mathrm{H}_2$
$\mathrm{H}^{+}$
$\quad \mathrm{O}_2$
NaOH
What is the total number of moles of ' C ' atoms and ' H ' atoms respectively present in n mole molecule represented by following structure?

$5 n$ and $8 n$
$4 n$ and $7 n$
$4 n$ and $6 n$
5 n and 7 n
Which from following reactions performs highest + ve work at $25^{\circ} \mathrm{C}$ ?
$\mathrm{CH}_{4(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow \mathrm{CH}_3 \mathrm{Cl}_{(\mathrm{g})}+\mathrm{HCl}_{(\mathrm{g})}$
$3 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{N}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$
$\mathrm{C}_2 \mathrm{H}_{2(\mathrm{~g})}+\frac{5}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(l)}$
$\quad 2 \mathrm{C}_2 \mathrm{H}_{6(\mathrm{~g})}+7 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 4 \mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$
Calculate the number of unit cells present in 0.6 g metal if the product of density and unit cell volume is $3.6 \times 10^{-22} \mathrm{~g}$.
$1.666 \times 10^{21}$
$3.333 \times 10^{21}$
$2.499 \times 10^{21}$
$4.833 \times 10^{21}$
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