Question

Underline/Select the word which does not belong to the group: calcium chloride, magnesium sulphate, carbon dioxide, calcium bicarbonate.

Answer 1

carbon dioxide because it is a gas and other are type of acid
hope it helps

Answer 2

Carbon Dioxide does not belong to the group of calcium chloride, magnesium sulphate, carbon dioxide and calcium bicarbonate.

Carbon Dioxide is a gas while calcium chloride, magnesium sulphate, and calcium bicarbonate are salts.

This is why carbon dioxide does not belong in the group that is mentioned in the question.