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Spent hardening salt is a potential waste in which of the following processes of hardening?

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Spent hardening salt is a potential waste in which of the following processes of hardening?

(a) Steel

(b) Rock salt

(c) Gold

(d) Coal

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This interesting question is from Microbial Transformations of Pesticides in chapter Microbial Transformations of Pesticides of Environmental Biotechnology

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Correct option is (a) Steel

To explain: Hardening of steel generates a hazardous waste that is Spent hardening salt, cyanide, nitrate and nitrate sludge which is very much hazardous to the environment and human health, so, it should be disposed of properly. But Hardening of rock salt, hardening of gold, hardening of coal doesn’t produce the wastes listed above because of different processing.

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