JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Environmental Chemistry

The concentration of dissolved oxygen (DO) is cold water can go upto:

(A)14 ppm
(B)8 ppm
(C)10 ppm✓ Correct
(D)16 ppm

Answer: (C)

Solution

The amount of oxygen water can hold rises as the water gets colder, because gas solubility increases at lower temperature. In cold, well-aerated water the dissolved oxygen can build up to about

10 ppm

, and it is this level that sustains aquatic life and sets the baseline for judging water quality.

JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option

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