Question

Q1. (i) In the experiment to demonstrate anaerobic respiration we are using mercury in the test tube and the beaker why can't we use water instead?

(ii). Also tell the use of lime water in the experiments on respiration

Answer 1

Mercury is used in the experiments o demonstrate anaerobic respiration because:
It is the only metal which occurs in liquid state and is a good conductor of heat.
It does stick to the walls of the capillary and hence, gives accurate results.
It has a uniform rate of expansion and contraction.
​​​​​It can be easily obtained in its pure state.
It has a low specific heat.


Uses in experiment of respiration:
Soda lime: To absorb any carbon dioxide released.

Alkaline pyrogallic acid: To absorb any oxygen released.

Lime water: To detect any carbon dioxide released

Potassium hydroxide: To absorb any carbon dioxide released.