Chemical Process
Pasteurisation of milk means

Removal of fatty and albuminous substance from it
None of these
Inhibiting the growth of micro-organisms without killing them
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics

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Chemical Process
Pick out the true statement pertaining to water treatment.

Normally, the turbidity is removed by adding a coagulent prior to sedimentation
Activated carbon can be used for taste & odour control without subsequent filtration
Slow sand filters can remove colour completely
Application of activated carbon reduces the temporary hardness of water

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Chemical Process
Pick out the wrong statement pertaining to nitric acid.

About 90% of nitric acid is manufactured by Ostwald
It is a strong mono basic acid which reacts with almost all the metals except noble metals
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
Arc process of nitric acid manufacture is economical as compared to Ostwald

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