Problem 1
Which of the following is an ore of sodium? (a) chile saltpeter (b) carnalite (c) sylvine (d) none of these
Problem 2
Which of the following is not efflorescent? (a) \(\mathrm{CuSO}_{4}\) (b) \(\mathrm{NaOH}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{MgSO}_{4}\)
Problem 3
Highly pure dilute solution of sodium in liquid ammonia (a) exhibits electrical neutrality (b) produces sodium amide (c) produces hydrogen gas (d) show blue colour
Problem 4
When carbon monoxide is passed over solid caustic soda and heated to \(200^{\circ} \mathrm{C}\), it forms (a) \(\mathrm{HCOONa}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{COONa}\) (d) \(\mathrm{NaHCO}_{3}\)
Problem 5
Which of the following is formed when sodium sulphate is boiled with powered sulphur? (a) \(\mathrm{NaHSO}_{4}\) (b) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\)
Problem 6
When sodium bicarbonate is heated, the product obtained is (a) \(\mathrm{Na}\) (b) \(\mathrm{NaCO}_{3}\) (c) \(\mathrm{NaHCO}_{3}\) (d) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
Problem 7
Carbon decomposes potassium carbonate into (a) \(\mathrm{C}\) (b) \(\mathrm{O}\) (c) \(\mathrm{KCN}\) (d) \(\mathrm{K}\)
Problem 8
Perchloric acid is prepared by the action of concentrated sulphuric acid on (a) potassium perchlorate (b) barium chlorate (c) barium chloride (d) sodium chloride
Problem 9
What happens, when a fire caused by potassium in the laboratory is extinguished by pouring water? (a) there is a decrease in fire intensity (b) there is an increase in fire intensity (c) the fire completely extinguished (d) none of these
Problem 10
Sodium amalgam is useful as (a) catalyst (b) oxidizing agent (c) bleaching agent (d) reducing agent
