Question

state one characteristic of chemical reaction taking place when
(i) dilute h2so4 is made to react with marble chips
(ii) dilute HCl is added to solution of lead nitrate in the cold
(iii) Water is added to CaO​

Answer 1

1) Na2CO3 + 2 HCl --------> 2 NaCl + CO2 + H2O

2) Lemon juice converts purple colour of the potassium permanganate to colorless as it is acidic.

3) BaCl2 + H2SO4 --------> BaSO4 + 2HCl

4) CaO (s) + H2O (l)Ca(OH)2