Question

When 100 ml of a ${{\rm{O}}_{\rm{2}}} - {{\rm{O}}_{\rm{3}}}$ mixture was passed through turpentine, there was the reduction of volume by 20 ml. If 100 ml of such as mixture is heated, what will be the increase in volume?
A.10 ml
B.20 ml
C.30 ml
D. 25 ml

Answer 1

Hint: We know that there are two types of analysis of organic compounds namely, qualitative analysis and quantitative analysis. Quantitative analysis is the determination of the quantity of an element present in a compound. Turpentine is used in quantitative analysis.

Complete step by step answer:
Let’s first discuss turpentine. Turpentine is a fluid which is formed on resin distillation. Its uses in chemistry are in the form of solvents. It absorbs ozone molecules when ozone is passed through it.

Here, the volume of ${{\rm{O}}_{\rm{2}}} - {{\rm{O}}_{\rm{3}}}$ mixture reduces by 20 ml on passing through turpentine. The reduction in volume is due to the absorption of ozone by turpentine oil. That means, the volume of ozone $\left( {{{\rm{O}}_{\rm{3}}}} \right)$ is 20 ml.

So, the volume of oxygen $\left( {{{\rm{O}}_2}} \right)$ is=100-20=80 ml

The heating of ozone produces oxygen molecules. The reaction is,

${\rm{2}}{{\rm{O}}_3} \to 3{{\rm{O}}_2}$

From the above reaction, we can say that 2 moles of ozone gives 3 moles of oxygen.
We know that volume is directly proportional to moles, so we can write 2 ml of ozone produces 3 ml of oxygen.
Here, the volume of ozone is 20 ml.
Now, using the unitary method we have to calculate the volume of oxygen produced on heating 20 ml of ozone.

Volume = $\dfrac{3}{2} \times 20 = 30\,{\rm{ml}}$


So, the volume of oxygen produced is 30 ml.
Now, we have to calculate the increase in volume.
Increase in volume = 30 ml-20 ml =10 ml

So, the correct answer is Option A.

Note: A variety of chemical compounds is synthesized from turpentine. Some commercially used products of turpentine are camphor, linalool etc. Two chief chemical components of turpentine are beta-pinene and alpha-pinene. The separation and purification of two pinenes are done by the process of distillation.