Question

Consider the given figure,

Two volumes of hydrogen react with one volume of oxygen to give two volumes of water vapour.
$\underset{100mL}{\mathrm{Hydrogen}}+\underset{A}{\mathrm{Oxygen}}⟶\underset{100mL}{\mathrm{Water}}$
The volumes of hydrogen and oxygen which combine together bear a simple ratio of $\dots B.\dots$.
The missing terms $A$ and $B$ respectively are

• A. $A\to 25mL,B\to 1:2$
• B. $A\to 50mL,B\to 1:2$
• C. $A\to 50mL,B\to 2:1$
• D. $A\to 25mL,B\to 2:1$

Answer 1

Answer: (C)

$100mL$ of hydrogen combines with $50mL$ of oxygen to give $100mL$ of water vapour.
Thus, the volumes of hydrogen and oxygen which combine together (i.e. $100mL$ and $50mL$ ) bear a simple ratio of $2:1$.