Question

22,23,24 answer fast pls

Answer 1

22) when exess HCl is added to the soln. the solution turns colourless as it neutralises when reacted with NaOH

(or)

Cu < Fe < Zn < Mg

two observations are:

(i) reddish brown deposition on iron filings.

(ii) copper sulphate solution turns pale.

23) a. the substances are sodium carbonate and sodium bicarbonate.

eq: 2CH3COOH+Na2CO3----> 2CH3COONa+H2O+CO2

CH3COOH+NaHCO3----> CH3COONa+H2O+CO2.

b. For testing the presence of CO2

it is passed through lime water. CO2 turns lime water milky.

24) It can be observed in yeast cells.

The process is Budding in yeast.

(or)

If one forgets to keep KOH then CO2 is not absorbed.

HOPE THIS HELPS YOU..