Chemical Process
Sulphuric acid completely saturated with sulphur trioxide is called

Concentrated sulphuric acid
Oleum
Sulphurous acid
Dilute sulphuric acid

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

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

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