Q. Which out of the following compounds is called photographer’s fixer?
A) $Na_{2}SO_{3}$
B) $Na_{2}S_{2}O_{3}\ .5H_{2}O$
C) $Na_{2}SO_{4}$
D) $Na_{2}S$
Explanation
(b)
$Na_{2}S_{2}O_{3}\ .\ 5H_{2}O\ (Hypo).$ It is called photographer’s fixer because it removes the excess AgBr in the form of soluble silver complex.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.