Question

II. Write true (T) or false (F).
1. Oxygen is a combustible gas.( )
2. Carbon monoxide in the air causes acid rain. .( )
3. LPG is an inflammable fuel.
AOO( )
4. Forest fire is an example of spontaneous combustion.( )
5. Candle flame is an example of non-luminous flame.( )


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Answer 1

Answer:

1. true
2. false
3. false
4. true
5. true

Answer 2

Answer:

(1). Oxygen is a combustible gas - False

(2). Carbon monoxide in the air causes acid rain. - True

(3). LPG is an inflammable fuel. - False

(4). Forest fire is an example of spontaneous combustion. - True

(5). Candle flame is an example of non-luminous flame. - True

Explanation:

1. Oxygen is by itself non-flammable. But in order to cause combustion, it needs a fuel, i.e. something that can burn.

2. Carbon monoxide gas is produced by the incomplete combustion of hydrocarbon fuels (petrol and diesel) in vehicle engines. The carbon monoxide gas is then oxidised to carbon dioxide gas, which reacts with water particles in the upper atmosphere to produce carbonic acid (acid rain).

3. LPG is generally stored and distributed as a liquid and it is widely used for process and space heating, cooking and automotive propulsion. . It is classified as highly flammable

4. The burning of White phosphorus on its own at room temperature is an example of spontaneous combustion. Forest fire can also be started by spontaneous combustion reaction due to the heat of the sun or due to spark of lightning from the sky.

5. Objects that cannot emit light energy by themselves are known as non-luminous