A hard material X which is mined from the earth is used as a house hold fuel and also for the generation of electricity at Thermal Power Stations. A soft material Y is also used us a fuel in the form of candles. A gaseous material Z which occurs along with petroleum is increasingly being used as a fuel in running vehicles in its compressed form.(a) What are materials, X, Y and Z?
(b) When materials X, Y and Z are burned separately:
(i) Which material burns by producing a yellow, luminous flame?
(ii) Which material ultimately burns without producing a flame?
(iii) Which material can burn in a gas stove by producing a blue flame?
(a) The hard material, X is coal as it is mined from the Earth and used in the generation of electricity.
The soft material, Y is wax as it is used as a fuel in the form of candles.
The gaseous material, Z is natural gas, occurring along with petroleum and increasingly used as a vehicular fuel in its compressed form.
(b) (i) Y (Wax) burns by producing a yellow, luminous flame due to incomplete combustion. This is because oxygen doesn't get a proper way to get into the wax vapour to burn it completely.
(ii) X (Coal) burns without producing a flame. It comprises some volatile substances that burn with a flame, and once those substances have completely burned out, the coal starts glowing red.
(iii) Z (Natural gas) can burn in a gas stove by producing a blue flame. This is because a stove has holes in its burner that allow the proper amount of oxygen needed for the complete combustion of the natural gas.
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