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Chemistry Question 58 – JEE-MAIN 2026

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The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is :

Recall the four main types of oxides based on their chemical behavior: basic, acidic, amphoteric, and neutral.

Step 1: Understand Oxide Classification✦ Active

Oxides are classified into four main types based on their chemical properties:

1. **Basic oxides:** Typically formed by metals (especially s-block metals). They react with acids (e.g., Na2O,K2O,CaO). 2. **Acidic oxides:** Typically formed by non-metals or metals in high oxidation states. They react with bases (e.g., CO2,SO2,Cl2O7). 3. **Amphoteric oxides:** React with both acids and bases (e.g., Al2O3,ZnO,As2O3). 4. **Neutral oxides:** Do not react with either acids or bases (e.g., CO,NO,N2O).

Step 2: Analyze Each Option○ Expand

Let's classify the oxides in each given option:

* **Option 1:** Na2O (Basic), K2O (Basic), Al2O3 (Amphoteric), As2O3 (Amphoteric). This set lacks acidic and neutral oxides.

* **Option 2:** Al2O3 (Amphoteric), As2O3 (Amphoteric), CO (Neutral), NO (Neutral). This set lacks basic and acidic oxides.

* **Option 3:** K2O (Basic), Cl2O7 (Acidic), As2O3 (Amphoteric), NO (Neutral). This set contains one of each type of oxide.

* **Option 4:** Na2O (Basic), N2O (Neutral), Al2O3 (Amphoteric), CO (Neutral). This set lacks an acidic oxide.

💡 Teacher's Secret Hint

Pay close attention to the oxidation state of the central atom, especially for transition metals and p-block elements, as it influences acidity.

Step 3: Identify the Correct Set○ Expand

Based on the analysis, Option 3 is the only set that contains all four kinds of oxides: basic (K2O), acidic (Cl2O7), amphoteric (As2O3), and neutral (NO).

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