Question Bank - General Science

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When carbon dioxide gas is passed through an aqueous solution of calcium hydroxide, a white precipitate of calcium carbonates is formed, along with water. What inference can be drawn from this chemical reaction?

A.
Metal carbonates are insoluble in water.
B.
Non-metallic oxides are acidic in nature.
C.
It is a redox reaction.
D.
Aqueous calcium hydroxide is lime water.

Solution:

The correct answer is Metal carbonates are insoluble in water. Concept:Double displacement reaction: It is a chemical reaction in which two compounds react and exchange their ions forming new products. This reaction often results in the formation of an insoluble compound called a precipitate. Explanation:When carbon dioxide gas is passed through an aqueous solution of calcium hydroxide, the following chemical reaction takes place: CO2 + Ca(OH)2 ? CaCO3 ? + H2OA white precipitate of calcium carbonates is formed, along with water.This is an example of a double displacement reaction. The precipitate CaCO3 (metal carbonate) is insoluble in water.

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