Chapter 11

\(\mathrm{H}_{2} \mathrm{O}_{2}\) has reducing action upon (a) \(\mathrm{PbS}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}\)

What reduces haematite in a blast furmace? (a) \(\bar{C}\) (b) CO (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{SO}_{2}\)

Which of the following is more covalent ? (a) \(\mathrm{BeH}_{2}\) (b) \(\mathrm{MgH}_{2}\) (c) \(\mathrm{CaH}_{2}\) (d) all are ionic

For metal oxides, when \(\Delta G^{\circ}\) is plotted against temperature, there is a point where the graph crosses \(\Delta G=\) zero line. Above this temperature (a) the oxide is stable (b) the oxide is unstable (c) the oxide melts (d) the oxide is reduced

On reaction with water, which of the following does not produce by hydride ? (a) \(\mathrm{Be}_{2} \mathrm{C}\) (b) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (c) \(\mathrm{CaH}_{2}\) (d) \(\mathrm{Ca}_{3} \mathrm{P}_{2}\)

In Blister copper, the blisters are formed due to passing out of the following gas (a) Nitrogen (b) \(\mathrm{CO}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{SO}_{2}\)

Which metal is separated from silver in cupellation? (a) \(\mathrm{Zn}\) (b) \(\underline{1}\) (c) \(\mathrm{Pb}\) (d) \(\mathrm{Sn}\)