Solid-waste treatment by pyrolysis refers to

AHeating in the absence of air ✓ Correct

BNo heating

CHeating in the presence of air

DTreating with chemicals before heating

Correct answer: (A) Heating in the absence of air

Explanation

Pyrolysis treats solid waste by heating it in the absence of air.

The claim of no heating is wrong because heat drives the process.

Heating in the presence of air would be combustion, not pyrolysis.

Treating with chemicals before heating describes a different pretreatment.

Without oxygen the waste decomposes into char, oil and gas rather than burning.

The gases produced can be captured and used as fuel.

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