Which of the following statements is /are correct ?
I) The flame of a Bunsen burner is blue when the air hole is open and yellow when the air hole is closed.

II) The liquid or solid wax never catches fire.

III) A substance cannot catch fire if its temperature is higher than its ignition temperature.

IV) Water should be poured over burning petrol, kerosene or diesel.

V) The middle zone of a candle emits the least light.

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I and II only

III and IV only

II, III and IV only

V only

answer is A.

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Detailed Solution

Wax when present in liquid state are solid state cannot catch fire due to it’s ignition temperature, it is more than normal room temperature but when we supply heat solid or liquid wax convert into vapours and catch fire.

A substance catch fire if its temperature is higher than its ignition temperature.

Water should not be poured over burning petrol, kerosene or diesel due to its density is more than respective liquids and goes down to bottom and cannot extinguish fire.

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