Study the experimental set up shown in given ...

CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 27 of 60

Marks: +1, -0

Study the experimental set up shown in given figure and choose the correct option from the following:

P	Q	Change observed in calcium hydroxide solution
(a) $\mathrm{K}_2\mathrm{CO}_3$	$\mathrm{Cl}_2$ gas	No change
(b) $\mathrm{KHCO}_3$	$\mathrm{CO}_2$ gas	No change
(c) $\mathrm{KHCO}_3$	$\mathrm{H}_2$ gas	Turns milky
(d) $\mathrm{K}_2\mathrm{CO}_3$	$\mathrm{CO}_2$ gas	Turns milky

Solution:

In the given experimental setup,

\mathrm{P}

is potassium carbonate

(\mathrm{K}_2\mathrm{CO}_3)

which when treated with dil

\mathrm{HCl}

, reacts vigorously producing carbon dioxide gas

(Q)

leaving the aqueous state of potassium chloride. The released carbon dioxide gas turns lime water milky due to the formation of calcium carbonate. The reaction can be represented as:

\underset{\text{Potassium carbonate}}{\mathrm{K}_2\mathrm{CO}_3(\mathrm{s})} + 2\mathrm{HCl}(\mathrm{l}) \rightarrow \mathrm{H}_2\mathrm{O}(\mathrm{l}) + \underset{\text{Carbon dioxide}}{\mathrm{CO}_2(\mathrm{g})\uparrow} + \underset{\text{Potassium chloride}}{2\mathrm{KCl}(\mathrm{aq})}

\underset{\underset{\text{(Lime water)}}{\text{Calcium hydroxide}}}{\mathrm{Ca}(\mathrm{OH})_2(\mathrm{aq})} + \underset{\text{Carbon dioxide}}{\mathrm{CO}_2(\mathrm{g})} \rightarrow \underset{\underset{\text{(White ppt)(Makes limewater milky")}}{\text{Calcium carbonate}}}{\mathrm{CaCO}_3(\mathrm{s})} + \underset{\text{water}}{\mathrm{H}_2\mathrm{O}(\mathrm{l})}

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