The acidic, basic and amphoteric oxides, respectively, are:
Classification of Elements & Periodicity · Class 11 · JEE Main Previous Year Question
The acidic, basic and amphoteric oxides, respectively, are:
- a
, ,
- b
, ,
- c✓
, ,
- d
, ,
, ,
🧠 Read the order — acidic, then basic, then amphoteric — and check each oxide in that exact slot The question is asking for one specific arrangement: first slot must be acidic, second basic, third amphoteric. Even one slot in the wrong category kills the option.
🗺️ Classify every oxide that appears Acidic (non-metal/metalloid): , , , . Basic (metal): , , , . Amphoteric (boundary): .
Now scan options: (a) basic, acidic, amphoteric → first two are flipped. ✗ (b) acidic, basic, acidic → third should be amphoteric, not acidic. ✗ (c) acidic, basic, amphoteric → all three slots correct. ✓ (d) basic, acidic, amphoteric → first two flipped. ✗
⚠️ The trap Option (a) looks tempting because , , are all valid examples of basic, acidic, amphoteric. But the question asked them in the order acidic-basic-amphoteric. Always read the order in the stem first; do not match by category alone.
visit the interactive periodic table page to revise all the acidic, basic, and amphoteric oxides.

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