1. Which is the most abundant gas in the earth's atmosphere ?
a Nitrogen
b Carbon
c Oxygen
d Chlorine
2. % of nitrogen in atmosphere ?
a 79.65%
b 78.02%
c 78.08%
d 77.98%
3. Which gas evolved from paddy fields and marshes ?
a Ethane
b Methane
c Oxygen
d Carbondioxide
4. Which toxic element present in automobile exhausts ?
a Tin
b Iron
c Cupper
d Lead
5. Which metal is used in the making of microchips ?
a Silicon
b Tin
c Lead
d Platinum
6. What is sodium carbonate commonly known as ?
a Baking soda
b Sodium bicarbonate
c Soda ash
d Washing soda or soda ash
7. Which gas evolved from paddy fields and marshes?
a Ethane
b Methane
c Oxygen
d Carbondioxide
