JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The mass of precipitate of silver chloride is found to be 14 g. The % purity of NaCl solution would be:

A) 95%

B) 85%

C) 75%

D) 65%

Correct Answer: A

Solution :

[a] The reaction that takes place is

\[NaCl+AgN{{O}_{3}}\xrightarrow{{}}AgCl\downarrow +NaN{{O}_{3}}\]

\[\therefore \] 143.5 g of \[AgCl\] is produced from 58.5 g

\[\therefore \]14 g of \[AgCl\] will be produced from \[\frac{58.5\times 14}{143.5}=5.70g\,NaCl\]

This is the amount of NaCl in common salt; % purity \[=\frac{570}{6}\times 100=95%\]%