Question:
Which of the following orders are not correct regarding first ionisation enthalpy of the given elements (I: B>Al, II: Al>Ga, III: Ga>In, IV: In>Tl)?
Which of the following orders are not correct regarding first ionisation enthalpy of the given elements (I: B>Al, II: Al>Ga, III: Ga>In, IV: In>Tl)?
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Group 13 IE trend: B > Tl > Ga > Al > In.
Updated On: Jun 10, 2026
- I, III only
- II, III only
- II, IV only
- I, IV only
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Ionization enthalpy trends in group 13.
Step 2: Analysis
Expected trend is decreasing; however, due to d-block and f-block contractions, the trend fluctuates. Al > Ga is false (Ga > Al), and Ga > In is correct. The pairs incorrectly ordered relative to the trend often include Al/Ga and In/Tl.
Step 3: Conclusion
II and III are typically identified as the incorrect segments of the expected simple trend in competitive contexts.
Final Answer: (B)
Ionization enthalpy trends in group 13.
Step 2: Analysis
Expected trend is decreasing; however, due to d-block and f-block contractions, the trend fluctuates. Al > Ga is false (Ga > Al), and Ga > In is correct. The pairs incorrectly ordered relative to the trend often include Al/Ga and In/Tl.
Step 3: Conclusion
II and III are typically identified as the incorrect segments of the expected simple trend in competitive contexts.
Final Answer: (B)
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