Question

Consider the following statements:
i) Atomic hydrogen is obtained by passing hydrogen through an electric arc.
ii) Hydrogen gas will not reduce heated aluminium oxide.
iii) Finely divided palladium absorbs large volume of hydrogen gas.
iv) Pure nascent hydrogen is best obtained by reacting $Na$ with $C_2{H}_{5}OH$.
Which of the above statement(s) is/are correct?

• A. i only
• B. ii only
• C. i, ii and iii
• D. ii, iii and iv

Answer 1

Answer: (C)

i, ii and iii

i) The normal diatomic hydrogen ($H_2$) is passed through an electric arc, which separates it into atomic hydrogen $\left(H\right)$.
ii) Standard electrode potential of aluminium is $-1.66V$, which is why it acts as a strong reducing agent.
iii) Finely divided palladium can be used as a catalyst and at room temperature it can absorb up to 900 times its own volume of hydrogen.
iv) $2C_2{H}_{5}OH+2Na\to 2C_2{H}_{5}ONa+H_2$