AIR

We breath in _ and breath out _.
1. carbon-di-oxide,oxygen
2. oxygen, carbon-di-oxide
3. sulphur, CO2
4. CO2, water
Which gives acidic oxides?
1. metals
2. non metals
3. metalloids
4. gases
The process of conversion of iron into its hydrated form of oxide in the presence of air and moisture is called _.
1. corrosion
2. rusting
3. staining
4. worting
Which can be used as a refrigerant?
1. Liquid Oxygen
2. Liquid Nitrogen
3. CO2
4. Argon
_ is the fourth most abundant element in the human body by mass.
1. oxygen
2. nitrogen
3. helium
4. hydrogen
Air contains _ nitrogen.
1. 21.2%
2. 30%
3. 78.09%
4. 34%
Trapping of radiation from the sun by green house gases in the atmosphere that leads to rise in the earth’s atmospheric temperature is called _.
1. global warming
2. greenhouse effect
3. glass effect
4. heating effect
Process of conversion of solid directly to vapour without reaching liquid state is called _.
1. vaporisation
2. sublimation
3. melting
4. heating
_ is the water produced when carbon dioxide is dissolved in water under pressure.
1. lime water
2. bake water
3. carbonated water
4. soda water
Gaseous jacket that surrounds the earth is called _.
1. environment
2. surroundings
3. atmosphere
4. blanket