Chemical Process
Commercially ethylene is produced from naphtha by

Pyrolysis
Catalytic dehydrogenation
Hydrocracking
Catalytic cracking

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

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

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