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

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

1.Hardening of steel

2.Hardening of rock salt

3.Hardening of gold

4.Hardening of coal

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