Question

Assertion : The concentration of pollutants in water or atmosphere is often expressed in terms of $ppm$.
Reason : Concentration in parts per million can be expressed as mass to mass, volume to volume and mass to volume.

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

Answer 1

Answer: (B)

When a solute is present in trace quantities it is convenient to express concentration in $ppm$.