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Water parameters change after being used in various industries, which of the following parameters is not altered in the end?

(a) Physical

(b) Chemical

(c) pH

(d) Volume

The question was posed to me in quiz.

Query is from Microalgal Culture in division Biotechnological Approaches of Microalgal Culture of Environmental Biotechnology

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The correct answer is (d) Volume

Easiest explanation: The waste water has an altered chemical and or physical properties when it is used by various industries, also, pH is one parameter which is also altered when the water parameters change but the volume of the water remains the same.

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