Fossil Fuels

Question 1

Why natural gas is preferred to coal for generating electricity in power plants?

Answer 1

Natural gas contains fewer impurities than coal does
Combustion of natural gas→CO2(g) + H2O(l)
→→GREENHOUSE GASES

Question 2

Greenhouse gases x3

Answer 2

Methane CH4
Carbon dioxide CO2
Water vapour H2O

Question 3

Combustion of candle(wax) deposit some black powder on the in the wall of inverted funnel,
wt is it & how?

Answer 3

Carbon soot.
The boiling point of the hydrocarbon in candle is too high.
So, there is an incomplete combustion
which gives out of a sooty flame.

Question 4

Kerosene or petrol has a higher boiling pt?

Answer 4

Kerosene

1. Kerosene molecules has a larger size than petrol’s,
2. The van der Waals’ forces is stronger than petrol’s,
3. More energy is required to separate the molecules.