JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Given below are two statements:
Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg.
Statement II: The ionic radius of \( O^{2-} \) is larger than that of \( F^{-} \).
In the light of the above statements, choose the correct answer from the options given below.
- A Both statement I and statement II are true
- B Both statement I and statement II are false
- C Statement I is false but statement II is true
- D Statement I is true but statement II is false
Answer & Solution
Correct Answer
(A) Both statement I and statement II are true
Step-by-step Solution
Detailed explanation
\( Na^{+}:-1s^{2} 2s^{2} 2p^{6} \) (fully filled electronic configuration) \( Mg^{+}:-1s^{2} 2s^{2} 2p^{6} 3s^{1} \) \( IE_{2} \) of \( Na > IE_{2} \) of Mg Size of \( O^{2-} > F^{-} \)
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