Question

What kind of reaction takes place when sodium chloride solution is mixed with silver nitrate solution?

Answer 1

You have two reactions occurring here.  The first is the addition of NaCl to AgNO3.  This produces AgCl and NaNO3 according to the reaction below:

NaCl + AgNO3 --> AgCl (s) + NaNO3

This is a double displacement reaction since both sets of ions switch places with each other.  AgCl is not soluble in water and precipitates out as a solid to make the mixture look cloudy white like milk.  If kept in the dark, the mixture will stay this way.  But on exposure to light, the second reaction happens.  This is the decomposition of the AgCl into silver metal and chlorine gas:

2AgCl --> 2Ag + Cl2

The silver solid is the dark colored solid and the chlorine will simply bubble out of solution.  As stated earlier, this is a decomposition reaction.

FURTHE

Answer 2

Answer: precipitation reaction

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

Precipitation is a double displacement reaction in which one of the product is formed in the solid or precipitated form.

sodium chloride+ silver nitrate :  

$NaCl(aq)+AgNO_3(aq)\rightarrow AgCl(s)+NaNO_3(aq)$