Question
Which of the following metals will react with $$NaOH$$ and $$KOH$$ to liberate hydrogen gas?
A.
$$Zn,Al,Fe{\text{ and }}Mg$$
B.
$$Al,Fe,Mg{\text{ and }}Sn$$
C.
$$Zn,Sn{\text{ and }}Al$$
D.
$$Fe,Mg{\text{ and }}Al$$
Answer :
$$Zn,Sn{\text{ and }}Al$$
Solution :
\[2Al+2NaOH+2{{H}_{2}}O\xrightarrow{\Delta }\] \[2NaAl{{O}_{2}}+3{{H}_{2}}\]
\[Sn+2NaOH+{{H}_{2}}O\xrightarrow{\Delta }\] \[N{{a}_{2}}Sn{{O}_{3}}+2{{H}_{2}}\]
\[Zn+2NaOH\xrightarrow{\Delta }\] \[N{{a}_{2}}Zn{{O}_{2}}+{{H}_{2}}\]