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JEE Main 201910 JanuaryMorning Shift
Exam
JEE Main
Year
2019
Date
10 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Environmental Chemistry

JEE Main 2019 · 10 January · Morning Shift · Chemistry · Environmental Chemistry

Water filled in two glasses A and B gave BOD values of 10 and 20,...

Water filled in two glasses A and B gave BODBOD values of 1010 and 20,20, respectively. The correct statement regarding them is

Options

  1. AA is suitable for drinking, whereas B is not
  2. BB is more polluted than A
  3. CBoth A and B are suitable for drinking
  4. DA is more polluted than B

Correct answer

B. B is more polluted than A

Step-by-step solution

A water supply with a BOD level of 3-5 ppm is considered moderately clean. In water with a BOD level of 6-9 ppm, the water is considered somewhat polluted because there is usually organic matter present and bacteria are decomposing this waste. Hence, Both A and B are not suitable for drinking. B with a higher value of BOD level is more polluted.
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