Question

mohan prepared lime water and next month used it for the experiment showing CO2 is evolved in process of respiration.
1- white precipitate is formed
2-white precipitate is not formed
3- lime water must be fresh
4-lime water can be used anytime

(a)-2 is correct
(b)-2and 3 are correct
(c)-1 and 4 are correct
(d)-2 and 4 are correct

Answer 1

(b) 2 and 3 are correct .

Because lime water must be fresh for doing the experiment.

Hope it helps...!!

Answer 2

Hii dear,

● Answer -
(b) 2 & 3 are correct

● Explanation -
Lime water experiment is used to study release of CO2 during respiration.

In this expt, you have to expire into flazk containing freshly prepared lime water via the tube.
CO2 released during respiration reacts with lime water to form CaCO3 which precipitates as white ppt.
Ca(OH)2 + CO2 --> CaCO3 + H2O

In this experiment, freshly prepared lime water is needed. Hence, no white ppt is formed.



Thanks for asking..