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5/43 MCQs for:

CHEMISTRY OF THE ELEMENTS: Nitrogen

Nitrogen can be obtained from air by the removal of oxygen, carbon dioxide and water vapour. As water flows into the aspirator bottle, it displaces the air in it into a second flask containing sodium hydroxide solution.

Which absorbs carbon dioxide from the air forming sodium carbonate.

Which absorbs carbon dioxide and oxygen from the air forming sodium carbonate.

Which absorbs oxygen from the air forming sodium oxide.

Which absorbs carbon dioxide from the air forming sodium oxide.

Industrially, nitric acid is manufactured by:

The Ostwald process.

The catalytic oxidation of ammonia and the Ostwald process.

None is correct.

The catalytic oxidation of ammonia.

Ammonia is used:

In laundry works because it is a solvent for grease and oil stains.

All are correct.

As a refrigerant or coolant because it is very volatile i.e. it evaporates rapidly.

In manufacture of nitrogenous fertilizers such as ammonium nitrate, ammonium phosphate and ammonium sulphate.

Nitrogen is found in group __ of the periodic table.

IV.

VI.

VII.

Natural methods of fixing atmospheric nitrogen include:

Lightning converts some of the atmospheric nitrogen to the oxides of nitrogen which dissolve in rain water and finally reach the soil where they are converted into nitrates.

Nitrogen-fixing bacteria or nitrifying bacteria such as Rhizobium, convert atmospheric nitrogen into soil nitrates.

Nitrogen-fixing bacteria or nitrifying bacteria such as Rhizobium, convert atmospheric nitrogen into soil nitrates and lightning converts some of the atmospheric nitrogen to the oxides of nitrogen which dissolve in rain water and finally reach the soil where they are converted into nitrates.

C) Nitrogen from the air is used to manufacture ammonia which is in turn used to make nitrogenous fertilizers such ammonium nitrate, ammonium phosphate, ammonium sulphate etc which are applied to the soil.