NEET 2015 Chemistry question

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other ?

(1)is a reducing agent
(2)is soluble in water
(3)is used as a food-preservativeCorrect
(4)forms 'acid-rain'

Answer: (3)

Solution

Both gases can act as reducing agents (SO readily; NO is oxidised to nitrate by strong oxidants), both dissolve in water (NO gives HNO + HNO; SO gives HSO) and both cause acid rain. So (1), (2) and (4) are

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Question ID VK-091672