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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3el219

Which of the following statements are correct?

ATincture of iodine is a $2$ - $3%$ solution of iodine in an alcohol-water mixture.
BA chlorine level of $0.2$ ppm means $0.2 g$ of $Cl X_{2}$ per litre of water.
CSulphur dioxide at very low concentration acts as a disinfectant.
DBithionol is a barbiturate added to soaps.

Answer: A, C

A level of 0.2 ppm is

0.2 mg

per litre of water (about

0.2 g

per

1 0^{6} g

), not

0.2 g

per litre, so statement 1 is false. Very dilute sulphur dioxide is a disinfectant, tincture of iodine is a 2-3 percent iodine solution in alcohol-water, and bithionol is an antiseptic, not a barbiturate. Statements 2 and 3 are correct.

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