Question

Assertion : Photochemical smog is produced by nitrogen oxides
Reason: Vehicular polIution is a major source of nitrogen oxides.

• A. If both assertion and reason are true and the reason is a correct explanation of the assertion
• B. If both assertion and reason are true but reason is not a correct explanation of the assertion
• C. If the assertion is true but reason is false
• D. If both the assertion and reason are false
• E. If the assertion is false but the reason is true

Answer 1

Answer: (B)

If both assertion and reason are true but reason is not a correct explanation of the assertion

Photochemical smog is the haze in the atmosphere accompanied by high levels of ozone and nitrogen oxides, caused by the action of sunlight on pollutants.So, the assertion is true.Also, They are produced from the reaction among nitrogen, oxygen and hydrocarbons (during combustion), especially at high temperatures. In areas of high motor vehicle traffic, such as in large cities, the amount of nitrogen oxides emitted into the atmosphere as air pollution can be significant.Hence reason statement is also true but it doesn't justify the assertion.