Multiple choice

Which of the following statements is not true?

  1. The international standards of drinking water contain fluoride 1 ppm and Pb < 50 ppb.

  2. London smog is reducing in nature.

  3. To control CO emission by automobiles, catalytic convertors are fitted into the exhaust pipes.

  4. Oil slicks in sea water decreases D.O. values.

  5. Industrial flue gases are freed from NOx and SOx pollutants by scrubbing them with NaOH.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This statement is false because industrial flue gases are freed from NOx and SOx pollutants by scrubbing them with H2SO4 or Ca(OH)2 or Mg(OH)2. Thus this option is correct.

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