Chemical Process
Thermoplastic materials

Are heavily branched molecules
Do not soften on application of heat
None of these
Are solvent insoluble

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Chemical Process
Presence of carbonaceous matter in the sewage

All of these
Reduces sulphate ions to sulphides causing obnoxious smell
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Increases the quantity of chlorine used for its purification

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Chemical Process
The chamber process is

Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
Non-catalytic and operates only on pyrites
None of these
A batch process for directly producing high strength (98 to 100%) H₂SO₄

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