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Which of the following is not a unit of hardness?

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in Engineering Chemistry II by (789k points)
Which of the following is not a unit of hardness?

(a) Parts per million

(b) Degree centigrade

(c) Degree clarke

(d) Degree French

The question was posed to me in an international level competition.

The query is from Hardness of Water topic in chapter Water and its Treatment of Engineering Chemistry II

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Correct answer is (b) Degree centigrade

For explanation: Degree centigrade is not a unit of hardness. Degree centigrade is the unit of temperature. The unit for hardness is ppm (parts per million), degree clarke and degree french. All these three units are inter-related.

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