Question

When carbon dioxide gas is passed in lime water it
turns milky due to the formation of
(1) Calcium carbonate (2) Calcium
(3) Calcium oxide (4) Oxygen

Answer 1

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When carbon dioxide gas is passed in lime water it turns milky due to the formation of "Calcium carbonate".

Answer 2

When carbon dioxide gas is passed in lime water it turns milky due to the formation of Calicum carbonate. Calicum carbonate is a white precipitate ( precipitate are insoluble substance forms during a chemical reaction )
Reaction:-
Ca(H2O)2 + CO2 ---> CaCO3 + H2O