Given below are two statements : one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$ : Assertion A : The first ionisation enthalpy decreases across a period. Reason $\mathbf{R}$ : The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below :

Question

Given below are two statements : one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$ :

Assertion A : The first ionisation enthalpy decreases across a period.

Reason $\mathbf{R}$ : The increasing nuclear charge outweighs the shielding across the period.

In the light of the above statements, choose the most appropriate from the options given below :

$\mathbf{A}$ is false but $\mathbf{R}$ is true

Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

$\mathbf{A}$ is true but $\mathbf{R}$ is false

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