Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Removing some quantity of SO₃ during intermediate stage
Increasing the oxygen concentration
Putting more quantity of V₂O₅ catalyst in the converter
Maintaining low temperature & pressure in the converter

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

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

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