Chemical Process
Systemic insecticides

Kill insects following external bodily contact
Are absorbed throughout the plant
Emit poisonous vapour
Are stomach poisons

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

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

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Chemical Process
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

All of these
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Its calorific value is very less
Tar neutralises the residual acids present in pitch

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