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A hard material \( \mathrm{X} \) 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 \( \mathrm{Y} \) is also used. as a fuel in the form of candles. A
VU gaseous material \( \mathrm{Z} \) which occurs alongwith petroleum is increasingly being used as a fuel in running vehicles in its compressed form.
(a) What are materials, \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) ?
(b) When materials \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) 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 ?
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