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

Dissolved salt
Silica
Dissolved oxygen
Suspended salt

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Chemical Process
Pick out the wrong statement pertaining to the soap manufacture.

Transparent soaps are made by cold process
Organic pigments are used as colouring materials in the soap manufacture
Both laundary as well as toilet soaps are manufactured by hot process
Colourless rosin is used in the manufacture of laundary soaps

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