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

Answer 1

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.

Complete answer:
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.