… substances have very low ignition temperature.

Burning of gas is an example of … combustion.

… zone is the hottest part of the candle.

Middle zone of candle is … in colour.

Spirit and petrol turn into … at room temperature.

… among these prevents burning.

The full form of LPG is

Middle zone of candle … hot.

Dark zone of candle … hot.

Among these not a combustible material …

Among these … is a com-bustible material.

Explosion takes place in

The colour of flame of candle at hottest zone is

… gas is released when potassium permanganate is heated.

… release oxygen on heating.