Chemical Process
Which of the following impurities in feed water for high pressure boiler is the most detrimental?

Silica
Dissolved salt
Suspended salt
Dissolved oxygen

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Chemical Process
Pasteurisation of milk means

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

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