Question

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

a.

Hardening of steel

b.

Hardening of rock salt

c.

Hardening of gold

d.

Hardening of coal

Posted under Environmental Biotechnology

Answer: (a).Hardening of steel

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Q. Spent hardening salt is a potentially hazardous waste in which of the following processes?
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