Question

2.3. Answer question numbers (a) – (d) on the basis of your understanding of the following paragraph
and the related studied concepts :
• Take some freshly prepared lime water in a test tube.
• Blow air through this lime water.
Pichkari
. Note how long it takes for the lime water to
turn milky
Rubber
Tube
• Use a syringe or pichkari to pass air through
tube
some fresh lime water taken in another test
Lime
Test tube
tube.
water
containing
lime water
(a) What change would you expect in figure 'a'
(a) (b)
and 'b'?
(a) Air being passed into lime water with a
(b) Why do you observe the change in 'b'?
pichkari/ syringe,
(c) What is the source of this component ?
(b) Air being exhaled into lime water
(d) State the significance of this activity.​

Answer 1

Answer:

a) In A, lime water will stay the same but in B, Lime water will turn milky.

b)  Due to the formation of Calcium Carbonate. The limewater Is Calcium hydroxide and we exhale carbon dioxide gas and when CO2 is passed through limewater, it turns milky due to the formation of calcium carbonate.

c) Chalk, Limestone and Marble are the common sources of Calcium Carbonate.

Explanation: