Question

When a certain quantity of oxygen was ozonised in suitable apparatus, the volume decreased by $4ml$. On addition of turpentine the volume further decreased by $8ml$. All volumes were measured at the same temperature and pressure. From these data, establish the formula of ozone.

• A. $O_3$
• B. $O_4$
• C. $O_5$
• D. $O_{6.5}$

Answer 1

Answer: (A)

$O_3$

Let the formula of ozone be $O_n$
When a certain quantity of oxygen was ozonised in suitable apparatus, the volume decreased by 4 ml.
$n{O}_2\rightleftharpoons 2O_n$
$n-2\propto 4$
On addition of turpentine the volume further decreased by 8ml. All volumes were measured at the same temperature and pressure.
$8mL=2\times 4mL$
$2=2n-4$
$6=2n$
$n=3$
Thus, the formula of ozone is $O_3$.