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NEET CHEMISTRYMedium

The correct sequence given below contains neutral, acidic, basic, and amphoteric oxide each, respectively is:

A

NO, ZnO, CO₂, CaO

B

ZnO, NO, CaO, CO₂

C

NO, CO₂, ZnO, CaO

D

NO, CO₂, CaO, ZnO

Step-by-Step Solution

To determine the correct sequence, we classify each oxide based on its nature as described in the NCERT text (Class 11, Section 3.7.3 and Class 12, Section 4.4.1):

  1. Neutral Oxide: NCERT explicitly lists CO, NO, and N₂O as neutral oxides. Thus, the sequence must start with NO.
  2. Acidic Oxide: Oxides of non-metals are generally acidic. CO₂ is a classic acidic oxide (forms carbonic acid with water).
  3. Basic Oxide: Oxides of s-block metals are basic. CaO (Calcium Oxide) is a strong basic oxide.
  4. Amphoteric Oxide: Oxides that react with both acids and bases are amphoteric. ZnO (Zinc Oxide) is a well-known amphoteric oxide (along with Al₂O₃).

The required sequence is Neutral, Acidic, Basic, Amphoteric.

  • Option 4: NO (Neutral), CO₂ (Acidic), CaO (Basic), ZnO (Amphoteric) fits this sequence perfectly.
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