Question

8) Which substances gives out smoke and harmful gases upon heating or
burning​

Answer 1

Answer:

Answer: Carbon fuels like wood, coal, petroleum release unburnt carbon particles. These fine particles are dangerous pollutants, which cause respiratory diseases such as asthma. Incomplete combustion of these fuels gives carbon monoxide gas, which is a very poisonous gas.

Answer 2

Answer:

Fires burning with lack of oxygen produce a significantly wider palette of compounds, many of them toxic. Partial oxidation of carbon produces carbon monoxide, while nitrogen-containing materials can yield hydrogen cyanide, ammonia, and nitrogen oxides. Hydrogen gas can be produced instead of water

Explanation:

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