Which of the following pair is correctly matched?

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Accepted Answer

1.  **Acidic Oxides:** According to NCERT , as the oxidation number of a metal increases, ionic character decreases and acidic character increases. $Mn_2O_7$ is explicitly cited as an acidic oxide that gives $HMnO_4$ with water. $SO_2$ is a non-metal oxide located on the right side of the periodic table, which are acidic . $TeO_3$ (Group 16) is also an acidic oxide.
2.  **Neutral Oxides:** NCERT  lists CO, NO, and $N_2O$ as neutral oxides. However, $NO_2$ is an acidic oxide (mixed anhydride of nitric and nitrous acid), making this option incorrect.
3.  **Basic Oxides:** $K_2O$ is a strongly basic oxide. However, $SnO_2$ is well-known as an amphoteric oxide, not a basic one.
4.  **Amphoteric Oxides:** $BeO$ and $Ga_2O_3$ are amphoteric. $GeO$ is distinct from the group; oxides of Group 14 elements in lower oxidation states (like CO) are often neutral or weakly acidic/amphoteric, but the grouping in Option 3 is the most definitively correct set according to periodic trends described in the texts.

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