First slide

Transition elements

Question

Which one of the following pairs of substances on reaction will not evolve $H_{2}$ gas ?

Moderate

A

Iron and $H_{2} {SO}_{4 (aq)}$
B

Iron and steam
C

Copper and ${HCl}_{(g)}$
D

Sodium and ethyl alcohol

Solution

$Fe + H_{2} {SO}_{4} ⇌ {FeSO}_{4} + H_{2}$
$\begin{array}{l} 3 Fe + 4 H_{2} O (steam) ⇌ {Fe}_{3} O_{4} + 4 H_{2} \\ Cu + {HCl}_{(g)} ⟶ No reaction \\ 2 Na + 2 C_{2} H_{5} OH ⟶ 2 C_{2} H_{5} ONa + H_{2} \end{array}$

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