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Which of the following statements is incorrect?

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$Δ H_{e g}$ value of noble gases are negative

Si ia diagonally related to B

The element which have higher $- Δ H_{e g}$ act as strong oxidising agent.

$H^{+}$ and ${Cs}^{+}$ are the smallest and largest cation in periodic table respectively.

answer is D.

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Detailed Solution

As, hydrogen contains one electron in the valence shell after losing an electron, hydrogen ions are the smallest cations. The largest cation is ${Cs}^{+}$ . So, option D has incorrect statement.

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