Question

Carbon dioxide gas turns limewater milky.
A. True
B. False

Answer 1

Hint:. In this particular question write the chemical equation for the reaction of carbon dioxide \[\left( {C{O_2}} \right)\] with limewater because from that we will get the product of the reaction which will tell us whether the product is milky or not.

Complete step by step answer:
As we know that the limewater is the solution of Calcium hydroxide i.e. \[Ca{\left( {OH} \right)_2}\].
So, now let us write the chemical reaction done when calcium hydroxide solution (Limewater) reacts with carbon dioxide.
\[Ca{\left( {OH} \right)_2} + C{O_2} \to CaC{O_3} + {H_2}O\]

So, now as we can see from the above chemical reaction that the product formed is calcium carbonate \[CaC{O_3}\] and water \[{H_2}O\].
And as we know that the colour of calcium carbonate \[CaC{O_3}\] is white. And water is also present in the product. So, due to this the appearance of the solution formed when carbon dioxide reacts with lime water becomes milky or we can say that the solution appears white.
So, the given statement is true.
So, the correct answer is “Option A”.

Note: Whenever we come up with this type of problem, we should remember that if carbon dioxide \[\left( {C{O_2}} \right)\] is passed for long time form limewater \[Ca{\left( {OH} \right)_2}\] then carbon dioxide starts reacting with calcium carbonate and the reaction for this will be \[CaC{O_3} + {H_2}O + C{O_2} \to Ca{\left( {HC{O_3}} \right)_2}\] which disappears the turbidity (cloudy) due to the formation of soluble calcium bicarbonate \[Ca{\left( {HC{O_3}} \right)_2}\].