Chemical Process
Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance.

Soda
Flint
Pyrex
Potash

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Chemical Process
Transparent soaps (e.g. Pears) are

Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent and free stearic acid to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered
None of these

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