Question

Assertion : Atoms can neither be created nor destroyed.
Reason : Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.

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

Answer 1

Answer: (C)

Atoms can neither be created nor destroyed. This is the statement of law of conservation of mass.

Under similar conditions of temperature and pressure, equal volume of gases contain equal number of atoms.

As, $PV = nRT$ (Ideal gas equation)

$\Rightarrow \,\,\,\frac{P_{1}V_{1}}{P_{2}V_{2}}=\frac{n_{1}RT_{1}}{n_{2}RT_{2}} $

$\Rightarrow n_{1}=n_{2}$

$\left(\because P_{1},=P_{2}, V_{1}=V_{2}, T_{1}=T_{2}\right)$