Question

Write the chemical equations involved in the following chemical reactions :

(i) White washing.

(ii) Black and white photography.

Answer 1

(i) In white washing, quicklime reacts with water to form slaked lime.

CaO+H₂O → Ca(OH)₂+Heat

CaO+H₂O-Quick lime 

Ca(OH)₂  -Slaked lime

(ii) Silver bromide,  when exposed to light decomposes to silver and bromine.

2AgBr(s) +sunlight → 2Ag(s)+Br₂(g)

2AgBr(s)-Silver bromide

2Ag(s)-Silver

Br₂(g)- Bromide