Question

Fill in the blanks using the words given in the box. ignition, petrol, combustion, calorific value, combustible, inflammable (a) A chemical process in which a substance reacts with oxygen to give off heat is called __________. (b) Wood, papers, CNG are __________ substances. (c) The lowest temperature at which a substance catches fire is called its __________ temperature. (d) Ignition temperature of __________ is lower than that of wood. (e) The substances which have very low __________ temperature and can easily catch fire with a flame are called __________ substances. (f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its __________.

Answer 1

a) combustion

b) combustible

c) ignition

d) petrol

e) ignition, inflammable

f) calorific value

Answer 2

a) combustion

b) combustible

c) ignition temperature

d) petrol

e) ignition. Inflammable

f). Calorific value