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Answer the following questions in a short sentences:
 
Fill in the blanks using the words given in the box.
 
ignitionpetrolcombustion
calorific valuecombustibleinflammable
 
(a). A chemical process in which a substance reacts with oxygen to give off heat is called .

(b). Wood, paper, 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 .