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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.
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Reason : Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.
Solution:
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Verified Answer
The correct answer is:
If the assertion is true but the reason is false.
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, $P V=n R T$ (Ideal gas equation)
If, for Ist case, for IInd case,
$$
\begin{aligned}
& P_1 V_1=n_1 R T_1 \\
& P_2 V_2=n_2 R T_2
\end{aligned}
$$
$$
\Rightarrow \quad \frac{P_1 V_1}{P_2 V_2}=\frac{n_1 R T_1}{n_2 R T_2} \Rightarrow n_1=n_2\left(\because P_1,=P_2, V_1=V_2, T_1=T_2\right)
$$
If, for Ist case, for IInd case,
$$
\begin{aligned}
& P_1 V_1=n_1 R T_1 \\
& P_2 V_2=n_2 R T_2
\end{aligned}
$$
$$
\Rightarrow \quad \frac{P_1 V_1}{P_2 V_2}=\frac{n_1 R T_1}{n_2 R T_2} \Rightarrow n_1=n_2\left(\because P_1,=P_2, V_1=V_2, T_1=T_2\right)
$$
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