Q. Which of the following is not soluble in NaOH?
A) $Fe(OH)_{3}$
B) $Zn(OH)_{2}$
C) $Al(OH)_{3}$
D) $Sn(OH)_{2}$
Explanation
(a)
$Fe(OH)_{3}$ is not soluble in NaOH
(b) $Zn\ (OH)_{2} + \ NaOH\ \rightarrow Na_{2}ZnO_{2} + \ 2H_{2}O\$
sod. Zincate
(soluble)
(c) $Al(OH)_{3} + NaOH\ \rightarrow NaAlO_{2} + \ 2H_{2}O$
sod. aluminate
(soluble)
(d) $Sn(OH)_{2} + \ NaOH\ \rightarrow Na_{2}SnO_{2} + \ 2H_{2}O$
sod. stannate
(soluble)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.