Q. Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is $KCN\ \ \ \ \ \ \ \ \ \ \ \ \ \ K_{2}SO_{4}\ \ \ \ \left( NH_{4} \right)_{2}C_{2}O_{4}\ \ \ NaCl$ $Zn\left( NO_{3} \right)_{2}\ \ \ \ {FeCl}_{3}\ \ \ \ \ \ K_{2}{CO}_{3}\ \ \ \ \ \ \ \ \ \ \ \ \ \ {NH}_{4}{NO}_{3}$ $LiCN$
A) 1
B) 2
C) 3
D) 4
Explanation
(c)
The aqueous solution of $KCN,\ K_{2}CO_{3}\ and\ LiCN$ turn red litmus blue because of alkaline nature.
The anionic hydrolysis turns the solution alkaline.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.