Correct Answer: Option 2
Explanation:
While moving from left to right in periodic table basic character of oxide of elements will decrease.
∴ → I n c r e a sin g b a s i c s t r e n g t h A l 2 O 3 < M g O < N a 2 O
and while descending in the group basic character of corresponding oxides increases.
∴ → I n c r e a sin g b a s i c s t r e n g t h N a 2 O < K 2 O
∴ C o r r e c t O r d e r i s A l 2 O 3 < M g O < N a 2 O < K 2 O
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