JEE Main · 2020 · Shift-ImediumPERI-037

The acidic, basic and amphoteric oxides, respectively, are:

Classification of Elements & Periodicity · Class 11 · JEE Main Previous Year Question

Question

The acidic, basic and amphoteric oxides, respectively, are:

Options
  1. a

    \ceNa2O\ce{Na2O}, \ceSO3\ce{SO3}, \ceAl2O3\ce{Al2O3}

  2. b

    \ceCl2O\ce{Cl2O}, \ceCaO\ce{CaO}, \ceP4O10\ce{P4O10}

  3. c

    \ceN2O3\ce{N2O3}, \ceLi2O\ce{Li2O}, \ceAl2O3\ce{Al2O3}

  4. d

    \ceMgO\ce{MgO}, \ceCl2O\ce{Cl2O}, \ceAl2O3\ce{Al2O3}

Correct Answerc

\ceN2O3\ce{N2O3}, \ceLi2O\ce{Li2O}, \ceAl2O3\ce{Al2O3}

Detailed Solution

🧠 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): \ceN2O3\ce{N2O3}, \ceSO3\ce{SO3}, \ceCl2O\ce{Cl2O}, \ceP4O10\ce{P4O10}. Basic (metal): \ceNa2O\ce{Na2O}, \ceLi2O\ce{Li2O}, \ceCaO\ce{CaO}, \ceMgO\ce{MgO}. Amphoteric (boundary): \ceAl2O3\ce{Al2O3}.

Now scan options: (a) \ceNa2O\ce{Na2O} basic, \ceSO3\ce{SO3} acidic, \ceAl2O3\ce{Al2O3} amphoteric → first two are flipped. ✗ (b) \ceCl2O\ce{Cl2O} acidic, \ceCaO\ce{CaO} basic, \ceP4O10\ce{P4O10} acidic → third should be amphoteric, not acidic. ✗ (c) \ceN2O3\ce{N2O3} acidic, \ceLi2O\ce{Li2O} basic, \ceAl2O3\ce{Al2O3} amphoteric → all three slots correct. ✓ (d) \ceMgO\ce{MgO} basic, \ceCl2O\ce{Cl2O} acidic, \ceAl2O3\ce{Al2O3} amphoteric → first two flipped. ✗

⚠️ The trap Option (a) looks tempting because \ceNa2O\ce{Na2O}, \ceSO3\ce{SO3}, \ceAl2O3\ce{Al2O3} 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.

Answer: (c)\boxed{\text{Answer: (c)}} visit the interactive periodic table page to revise all the acidic, basic, and amphoteric oxides. image

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The acidic, basic and amphoteric oxides, respectively, are: (JEE Main 2020) | Canvas Classes