Question

limewater turns milky when air is passed through it

Answer 1

hey there

lime water turns milk when CO2 is passed in it

REASON-

Because of the production of CaCO3

lime water = CaO

reaction -

CaO + CO2 -----> CaCO3

Answer 2

Heyaa folk,

CaCO3 = Lime Water (Calcium Carbonate.

CaO = Calcium Oxide.

CO2 = Carbon Dioxide.

We can write the equation as,
CaO + CO2 ➞ CaCO3

i.e. Carbon Dioxide added with Calcium Oxide gives Lime water means Calcium Carbonate.

It turns milky i.e. calcium's properties started to applying it. (To the solution).

As the calcium oxide looks like the milk. (white in colour).

Hope it helps u :)