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As you move across a period from left to right, the ionic radii tend to decrease. Which statement below is accurate?

1. The sequence of ionic radii for cations is Cr2+ > Mn2+ > Fe2+ > Ni2+.
2. Higher positive charge on an atom results in greater effective nuclear charge, leading to a smaller size.
3. N2O5 exhibits strong acidity, ZnO and Al2O3 are amphoteric in nature, and MgO is the most basic among them.
4. Non-metals combine with oxygen to form oxides, which can reduce metal oxides, acting as reducing agents.

Correct answer: N2O5 exhibits strong acidity, ZnO and Al2O3 are amphoteric in nature, and MgO is the most basic among them.

Solution

Option C is correct because MgO is a basic oxide, while N2O5 is acidic, and ZnO and Al2O3 are amphoteric. This aligns with the periodic trends in oxide nature.

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