Chemical Process
Nitrile rubber is produced by the polymerisation of

Isobutylene and isoprene
Acrylonitrile and butadiene
None of these
Acrylonitrile and styrene

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Chemical Process
Presence of sodium tripolyphosphate (an additive) in synthetic detergent

None of these
Inhibits its corrosive effects
Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
Does not allow redeposition of dirt on the cleaned surface

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