Question

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 ?

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

X is coal y is wax z is cng

Answer 2

Explanation:

(a) What are materials, X, Y and Z - Metal X is coal, Y is wax and Z is natural gas.

(b) When materials X, Y and Z are burned separately :

(i) Which material burns by producing a yellow, luminous flame - The material that burns is Y ( wax).

(ii) Which material ultimately burns without producing a flame - The material that burns is X (coal)

(iii) Which material can burn in a gas stove by producing a blue flame - The material that burns is Z (natural gas).