Chapter 9

Which of the following is produced when magnesium reacts with hot concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{S}\) (c) \(\mathrm{MgO}\) (d) \(\mathrm{SO}_{2}\)

Which of the following process is used in the extractive metallurgy of magnesium? (a) Self reduction (b) Fused salt electrolysis (c) Thermite reduction (d) Aqueous solution electrolysis

Which of the following alkali metal ions has lowest ionic mobility in aqueous solution? (a) \(\mathrm{Na}^{+}\) (b) \(\mathrm{Li}^{+}\) (c) \(\mathrm{Rb}^{+}\) (d) \(\mathrm{Cs}^{+}\)

\(\mathrm{NaOH}\) is prepared by the method: (a) Castner cell (b) Down's cell (c) Castner Kellner cell (d)Solvay process

For the preparation of sodium thiosulphate by "Springs reaction" the reactants used are: (a) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{SO}_{2}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{S}\) (c) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{I}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{Cl}_{2}\)

Brine solution on electrolysis will not give: (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{NaOH}\) (d) \(\mathrm{Cl}_{2}\)

Carnallite on electrolysis gives: (a) \(\mathrm{Na}\) and \(\mathrm{CO}_{2}\) (b) \(\mathrm{Mg}\) and \(\mathrm{Cl}_{2}\) (c) \(\mathrm{Al}\) and \(\mathrm{Cl}_{2}\) (d) \(\mathrm{Ca}\) and \(\mathrm{Cl}_{2}\)

Which of the following does not give flame colouration? (a) \(\mathrm{Mg}\) (b) \(\mathrm{Ca}\) (c) \(\mathrm{Sr}\) (d) \(\mathrm{Ba}\)

Several blocks of magnesium are fixed to the bottom of a ship to: (a) Keep away the sharks (b) Prevent action of water and salt (c) Make the ship lighter (d) Prevent puncturing by under sea rocks

Lithium is similar to magnesium in many properties. This is because (a) Both have nearly the same size. (b) The ratio of the charge to size is nearly the same (c) Both have similar electronic configurations (d) Both have nearly the same \(\mathrm{N} / \mathrm{P}\) ratio.