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Identify the sequence that is not arranged correctly.

1. NH3 < PH3 < AsH3 – acidity
2. Li < Be < B < C – first ionization potential
3. Al2O3 < MgO < Na2O < K2O – basic character
4. Li+ < Na+ < K+ < Cs+ – ionic radius

Correct answer: Li < Be < B < C – first ionization potential

Solution

The correct option is right because the first ionization potential generally increases across a period from left to right due to increasing nuclear charge, which is not accurately reflected in the sequence provided.

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