When iron nails are dropped in a copper sulphate solution, then ____.

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When iron nails are dropped in copper sulphate the blue colour changes to green. Iron, being more reactive than copper displaces copper from the copper sulphate solution.

In a precipitation reaction, one of the products formed is ____.

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In a precipitation reaction, aqueous solution of two salts react and one of the products formed is a precipitate, which is an insoluble salt.

Which of the following is not a decomposition reaction?

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In the process of photosynthesis carbon dioxide and water combine to form starch, hence, it is a combination reaction.

ICSE Class 9th Chemistry - Chemical changes and reactions MCQs
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