Q. 575.0( 2 Votes )
A hard material X which is mined from the earth is used as a household fuel and also for the generation of electricity at Thermal Power Stations. A soft material Y is also used as 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 bums without producing a flame?
(iii) Which material can bum in a gas stove by producing a blue flame?
(b) (i) Y (wax) (ii) X (coal) (iii) Z (natural gas)
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