Four alternatives are given to each of the following incomplete statements questions. Choose the right answer. Which of the following is not a pure substance
A
Common salt
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B
sugar
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C
Rain water
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D
Iron
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Solution
The correct option is C Rain water Common salt, sugar, and iron are pure substances but rainwater is not pure.
Rainwater consists of several gases like carbon dioxide, oxygen, oxides of nitrogen, and sulphur. It also contains dust particles hence rainwater is not a pure substance.