Question

$ 200\text{ }ml $ of pure oxygen is subjected to electric discharge. $ 15% $ of oxygen is converted into ozone. The volume of ozonised oxygen is:
(A) $ 20\text{ }ml. $
(B) $ 30\text{ }ml. $
(C) $ 190\text{ }ml. $
(D) $ 80\text{ }ml. $

Answer 1

Hint :We know that by passing a slow dry steam of oxygen through a silent electrical discharge, oxygen can be converted to ozone. The product formed through this process is known as ozonized oxygen. Ozone is less stable than oxygen. Ozone has a bent structure and has resonating structures too. Ozone is a powerful oxidant more than that of oxygen. Ozone can oxidise metals more easily than oxygen.

Complete Step By Step Answer:
Ozone is basically referred to as ozonized oxygen. The function of ozone is that it prevents the living from harmful radiations (UV) coming from the sun. It lies generally fifteen miles above earth’s surface. Ozone is prepared in the laboratory by passing silent electric discharge through dry oxygen. Silent electric discharge is given in order to produce less heat as ozone is prone to decompose back into oxygen with increase in temperature with oxygen molecules to form ozone. Ozone consists of three oxygen atoms and an oxygen molecule has two oxygen atoms. The properties of ozone and oxygen molecules are entirely different. When the mixture of ozone and oxygen is passed through turpentine oil ozone gets absorbed.
A sparkless or silent electrical discharge is essential for the reaction to create less heat because ozone becomes expected to dissociate into oxygen and the temperature becomes raised (Le Chatelier’s principle). Therefore, ozone is formulated to promote the above conditions in a specifically built system named ozonizer. An 'Ozonizer' is the ozone collection system used to clean ozone through silent electricity. The Siemen's and the Brodie Ozonizers are two forms of ozonizers. Here we have:
Volume of oxygen $ =\text{ }200mL $
Percentage of oxygen converted to ozone $ =\text{ }15% $
Volume of ozone formed $ =\text{ }V $
 $ 15%=\left( \dfrac{v}{200} \right)\times 100\Rightarrow V=\dfrac{15}{100}\times 200=30\text{ }mL $
The volume of ozonized oxygen is $ 30\text{ }mL $
Therefore, the correct answer is option B.

Note :
Remember that the ozone is synthesized from oxygen. Decomposition of ozone to oxygen occurs when it is heated. Two moles of ozone gives three moles of oxygen. Trioxygen or ozone is an allotrope of oxygen. It is highly poisonous when in large concentration. In the atmosphere, ozone is formed by the action of ultraviolet light.