Question

(i)what do you mean by precipitaton reacton?
(ii)name the rection takng place in the presence of sunlight?
(iii)what is a balanced chemical reaction?
u can answer any two but atleast two

Answer 1

1. when during a chemical reaction an insoluble product is formed,which can be separated from the solution by filtration , then the solid product is known as precipitate and the reaction involved in precipitation reaction.
NaCl+ AgNO3 →NaNO3 + AgCl
2. Photochemical reaction 

Answer 2

2AgCl (g) ⇒( in presence of sunlight) 2Ag (s) +Chlorine (Cl  ) ( g )
                                                                                     ²

a chemical equation is said to be balanced, when the no. of atoms of each elements is same on both reactants sibe and products side