Chemical Process
Carboxymethyl cellulose (CMC) is added in detergents to

None of these
Prevent redeposition of soil on cleaned surface
Inhibit corrosion in washing machines made of aluminium
Act as optical brightening agent

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

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
None of these
Inhibits its corrosive effects

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