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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 burns without producing a flame ?(iii) Which material can burn in a gas stove by producing a blue flame ? |
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Answer» (a) X is coal; Y is wax; Z is natural gas (b)(i) Y (wax) (ii) X (coal) (iii) Z (natural gas) |
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