Question

# Nascent hydrogen is obtained from the reaction between: A ) $\text{Na and }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{OH}$B ) $\text{Al and NaOH}$C ) $\text{Zn and dil }{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}$D ) All of these

Hint: Nascent hydrogen is freshly generated hydrogen, that is highly reactive. Nascent hydrogen is generated in situ by the action of a metal on a salt solution.
Nascent hydrogen is obtained by single displacement reaction in which a metal displaces hydrogen from its salt solution.

Nascent hydrogen is more reactive than molecular hydrogen. During production of nascent hydrogen, a huge amount of energy is released. This energy activates nascent hydrogen. Hence, nascent hydrogen is energy rich as compared to molecular hydrogen. When nascent hydrogen is formed, it has a form of minute bubbles with high internal pressure. This makes nascent hydrogen more reactive.
Nascent hydrogen is obtained from the reaction between (A) $\text{Na and }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{OH}$ (B) $\text{Al and NaOH}$and (C) $\text{Zn and dil }{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}$.
Sodium reacts with ethanol to form sodium ethoxide and ethanol. Write the balanced chemical equation.
$\text{Na + }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{OH }\to \text{ }{{\text{C}}_{2}}{{\text{H}}_{5}}\text{ONa + }\left[ \text{H} \right]$
Aluminium reacts with sodium hydroxide to liberate nascent hydrogen.
Write the balanced chemical equation.
$\text{Al + 2 NaOH }\to \text{ N}{{\text{a}}_{2}}\text{Al}{{\text{O}}_{2}}\text{ + 2 }\left[ \text{H} \right]$
Zinc reacts with dilute sulphuric acid to form zinc sulphate and nascent hydrogen.
Write the balanced chemical equation.
$\text{Zn + dil }{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}\text{ }\to \text{ ZnS}{{\text{O}}_{4}}\text{ + 2 }\left[ \text{H} \right]$

Hence, option D ) All of these is the correct answer.

Note: Do not mix the concepts of nascent hydrogen and atomic hydrogen. Nascent hydrogen is freshly prepared, highly reactive hydrogen. Whereas atomic hydrogen is stable and does not readily form bonds.