1) Substances that burn in air and produces heat and light are called : a) Combustible b) Non-Combustible c) Both of the above d) None of the above 2) Substances that don’t burn in air are called: a) Combustible b) Non-Combustible c) Both of the above d) None of the above 3) Burning of petrol is an example of a _______________ Combustion. a) Spontaneous b) Rapid

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