ICSE Class 10 Chemistry 2022 Solved Paper

Identify the gas ${P}$ and ${Q}$ in the reactions given below :

Question : 23 of 55

Marks: +1, -0

A compound reacts with an acid to form gas

{P}

which has no effect on acidified

{\K}_2 {\Cr}_2 {\O}_7

solution but turns lime water milky.

Solution:

Gas ${\P}$ is carbon dioxide.
As gas carbon dioxide turns lime water milky, due to formation of white ppt. of calcium carbonate.

{\Ca}( {\OH})_2+ {\CO}_2 → {\CaCO}_3 ↓+ {\H}_2 {\O}

The gas has no effect on filter paper dipped in acidified

{\K}_2 {\Cr}_2 {\O}_7

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