Question

Which of the following metals will react with NaOH and KOH to liberate hydrogen gas?

• A. Zn, Al, Fe and Mg
• B. Al, Fe, Mg and Sn
• C. Zn, Sn and Al
• D. Fe, Mg and Al

Answer 1

Answer: (C)

Zn, Sn and Al

Answer 2

:

$2Al + 2NaOH + 2H_{2}O\overset{\quad\Delta\quad}{\rightarrow}2NaAlO_{2} + 3H_{2}$

$Sn + 2NaOH + H_{2}O\overset{\quad\Delta\quad}{\rightarrow}Na_{2}SnO_{3} + 2H_{2}$

$Zn + 2NaOH\overset{\quad\Delta\quad}{\rightarrow}Na_{2}AnO_{2} + H_{2}$