Air, Oxygen and Oxides

________ compounds of oxygen are called oxide

• Primary

• Binary

• Tertiary

• Tetra

Metallic oxides may be _________ in nature.

• Acidic

• Basic

• Amphoteric

• basic or amphoteric

___________ is used by plants for protein synthesis.

• Oxygen

• Carbon monoxide

• Nitrogen

• Sulphur

The oxide which has no effect on moist litmus paper.

• Acidic

• Basic

• Amphoteric

• Neutral

The process which occurs in a series of steps in the presence of enzymes

• Respiration

• Burning

• Rusting

• Combustion

The nature of oxygen gas is

• white in colour and odourless

• white in colour and pungent in odour

• colourless and pungent in odour

• Colourless and odourless

The amount of oxygen present in air is

• 78%

• 21%

• 0.2%

• 29%

Break down of carbonaceous organic compounds adds _______ to the air.

• Oxygen

• Nitrogen

• Carbon dioxide

• Sulphur dioxide

The component _____ of air provides moisture for plant and animal growth.

• Nitrogen

• Oxygen

• Inert gases

• Water vapour

The form of energy that is liberated during burning is -

• electrical energy

• thermal energy

• hydroenergy

• wind energy