Chemical Process
Mannheim furnace is used in the manufacture of

Hydrochloric acid
Corundum
H₂SO₄ by Chamber process
Calcium carbide

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

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

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