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Chemistry
Which of the following combination will produce H2 gas?
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Q. Which of the following combination will produce $H_2$ gas?
JEE Advanced
JEE Advanced 2017
The d-and f-Block Elements
A
$Fe$ metal and conc. $HNO_3$
B
$Cu$ metal and conc. $HNO_3$
C
$Zn$ metal and $NaOH_{(aq)}$
D
$Au$ metal and $NaCN_{(aq)}$ in the presence of air
Solution:
$Zn +2 NaOH \longrightarrow Na _{2} ZnO _{2}+ H _{2} \uparrow$