The incorrect order of properties for the fol | vedclass

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(D) Let us analyze each option:$(a)$ Basic nature: $Na_2O$ (strongly basic) $> MgO$ (basic) $> Al_2O_3$ (amphoteric) $> SiO_2$ (acidic). This order is

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$(c), (d)$

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(D) Let us analyze each option:$(a)$ Basic nature: $Na_2O$ (strongly basic) $> MgO$ (basic) $> Al_2O_3$ (amphoteric) $> SiO_2$ (acidic). This order is correct.$(b)$ $2^{nd}$ Ionization Potential $(I.P.)$: The electronic configurations are $Na^+ (2s^2 2p^6)$,$S^+ (3s^2 3p^3)$,$P^+ (3s^2 3p^2)$,$Si^+ (3s^2 3p^1)$. $Na^+$ has a stable noble gas configuration,so it has the highest $2^{nd}$ $I.P.$. Among others,$S^+$ has a half-filled $p$-orbital,making it higher than $P^+$ and $Si^+$. The correct order is $Na > S > P > Si$. This order is correct.$(c)$ Electron affinity: Due to the small size of $O$,electron-electron repulsion is high,making its electron affinity lower than $S$. The correct order is $S > O > Se$. Thus,$O > S > Se$ is incorrect.$(d)$ Size: For the same element,the size decreases as the number of electrons decreases. The correct order is $I^- > I > I^+$. Thus,$I^- Therefore,the incorrect orders are $(c)$ and $(d)$.

The incorrect order of properties for the following is:

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