Question

4) What happens when water is added to solid calcium oxide taken in a
container? Write a chemical formula for the same.
5. Give three examples of decomposition reaction.​

Answer 1

Answer:

WHEN WATER IS ADDED TO SOLID CALCIUM OXIDE THEN FORMED CALCIUM HYDROXIDE.

CaO + H2O -----> Ca(OH)2

THREE EXAMPLES OF DECOMPOSITION REACTION.

1. THERMAL DECOMPOSITION REACTION

EXAMPLE:- Ca(OH)2 ----> CaO + H2O

2. ELECTROLYTIC DECOMPOSITION REACTION

EXAMPLE:- H2O ----> H2 + O2

3.PHOTO DECOMPOSITION REACTION

AgCl -----> Ag + cl

Answer 2

Answer:

(4). Cao+H2o=ca(oH)2

(5)

AgCl2+light =Ag+Cl2

AgBr2+light =Ag+Br2