Give scientific reason. When the gas formed on heating limstone i…

Question

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

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Answer

1. When limestone is heated, calcium oxide and carbon dioxide gas are formed.
$
\underset{\substack{\text { Calcium } \\
\text { carbonate }}}{ CaCO _{3( s )}}+\text { Heat } \longrightarrow \underset{\substack{\text { Calcium } \\
\text { oxide }}}{ CaO _{( s )}}+\underset{\begin{array}{c}
\text { Carbon } \\
\text { dioxide }
\end{array}}{ CO _2 \uparrow}
$
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.
$
\underset{\substack{\text { Calcium } \\ \text { hydroxide }}}{ Ca ( OH )_{2( aq )}}+\underset{\substack{\text { Carbon } \\ \text { dioxide }}}{ CO _{2( g )}} \longrightarrow \underset{\substack{\text { Calcium } \\ \text { carbonate }}}{ CaCO _{3( s )}}+\underset{\text { Water }}{ H _2 O _{( l )}}
$

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