Q. Which of the following dissolves in hot conc. NaOH solution?
A) Fe
B) Zn
C) Cu
D) Ag
Explanation
(b)
Zn dissolves in conc. NaOH due to the formation of sodium zincate.
$Zn + 2NaOH\ \ \rightarrow Na_{2}ZnO_{2} + 2H_{2}O + 3NaCl$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.