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) {\K}_2 {\CO}_3 {\Cl}_2 gas No change (b) {\KHCO}_3 {\CO}_2 gas No change (c) {\KHCO}_3 {\H}_2 gas Turns milky (d) {\K}_2 {\CO}_3 {\CO}_2 gas Turns milky

CBSE Class 10 Science 2021 Term 1 Solved Paper - Question 27

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) ${\K}_2 {\CO}_3$	${\Cl}_2$ gas	No change
(b) ${\KHCO}_3$	${\CO}_2$ gas	No change
(c) ${\KHCO}_3$	${\H}_2$ gas	Turns milky
(d) ${\K}_2 {\CO}_3$	${\CO}_2$ gas	Turns milky

Solution:

In the given experimental setup,

{\P}

is potassium carbonate

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

which when treated with dil

{\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:

{ {\K}_2 {\CO}_3( {\ s})}↙{\text "Potassium carbonate"}+2 {\HCl}( {\l}) → {\H}_2 {\O}( {\l})+ {{\CO}_2( {\g}) ↑}↙{\text "Carbon dioxide"}+{2\KCl(\aq)}↙{\text "Potassium chloride"}

{ {\Ca}( {\OH})_2( {\aq})}↙{\text "Calcium hydroxide"↙{\text "(Lime water)"}}+ {\CO_2(\g) }↙{\text "Carbon dioxide"}→ { {\CaCO}_3( {\ s})}↙{\text "Calcium carbonate"↙{\text "(White ppt)(Makes limewater milky")}}+ {{\H}_2 {\O}( {\l})}↙{\text "water"}

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