# Give scientific reason. When the gas formed on heating limstone is passed through freshly prepared lime water, the lime water turns milky. - Science and Technology 1

Short Note

Give scientific reason.

When the gas formed on heating limstone is passed through freshly prepared lime water, the lime water turns milky.

#### Solution

1. When limestone is heated, calcium oxide and carbon dioxide gas are formed.
$\ce{\underset{\text{carbonate}}{\underset{\text{Calcium}}{CaCO_{3(s)}}} + Heat -> \underset{\text{oxide}}{\underset{\text{Calcium}}{CaO_{(s)}}} + \underset{\text{dioxide}}{\underset{\text{Carbon}}{CO_2↑}}}$
2. When carbon dioxide gas is passed through freshly prepared lime water, the solution turns milky due to the formation of calcium carbonate, which is insoluble in water.
$\ce{\underset{\text{hydroxide}}{\underset{\text{Calcium}}{Ca(OH)}_{2(aq)}} + \underset{\text{dioxide}}{\underset{\text{Carbon}}{CO_{2(g)}}} -> \underset{\text{carbonate}}{\underset{\text{Calcium}}{CaCO_{3(s)}}} + \underset{\text{Water}}{H2O}_{(l)}}$
Concept: Types of Chemical Change or Chemical Reaction - Double Displacement Reaction
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#### APPEARS IN

Balbharati Science and Technology Part 1 10th Standard SSC Maharashtra State Board
Chapter 3 Chemical reactions and equations
Q 4.1 | Page 45
SCERT Maharashtra Question Bank 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021
Chapter 3 Chemical reactions and equations
Write scientific reasons | Q 3