Chemistry
Grade-8
Easy
Question
Read the following paragraph carefully. To a small quantity of (X), a few drops of HCl are added. Consequently, a colorless, odorless gas (Y) is formed. This gas(Y) on passing through lime water turns it milky due to the presence of (Z), and then the milkiness disappears due to the formation of (W)
Identify the compounds X, Y, Z, and W in the above change.
Hint:
Use the reaction of metal carbonate with acid.
The correct answer is:
To a small quantity of sodium carbonate, a few drops of HCl are added. Consequently, a colorless, odorless gas carbon dioxide is formed. This carbon dioxide on passing through lime water turns it milky due to the presence of calcium carbonate, and then the milkiness disappears due to the formation of calcium bicarbonate.
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