Chemistry
Bleaching action of moist sulphur di-oxide is because of its

Oxidising property
Basic property
Reducing property
Acidic property

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Chemistry
Aqua regia is a 1 : 3 mixture, by volume, of

Conc. hydrochloric acid and conc. nitric acid
Conc. nitric acid and conc. hydrochloric acid
Conc. sulphuric acid and conc. nitric acid
Conc. nitric acid and conc. sulphuric acid

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Chemistry
Assertion (A) : Synthetic detergents can lather wen in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A is false but R is true
Both A and R is true but R is not a correct explanation of A
A is true but R is false
Both A and R is true and R is the correct explanation of A

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