JEE Chemistry 2023 Question with Solution

Given: The oxides are $N_2O_3$, $NO$, $N_2O$, $Cl_2O_7$, $SO_2$, $CO$, $CaO$, $Na_2O$ and $NO_2$.

Find: The total number of acidic oxides.

Acidic oxides react with water to form acids.

• Acidic oxides: $N_2O_3$, $Cl_2O_7$, $SO_2$, $NO_2$
• Neutral oxides: $NO$, $N_2O$, $CO$
• Basic oxides: $CaO$, $Na_2O$

Therefore, the total number of acidic oxides is $4$.

Given: A list of oxides is provided.

Find: How many of them are acidic.

Classify each oxide by its acid-base nature:

1. $N_2O_3$ — acidic oxide
2. $NO$ — neutral oxide
3. $N_2O$ — neutral oxide
4. $Cl_2O_7$ — acidic oxide
5. $SO_2$ — acidic oxide
6. $CO$ — neutral oxide
7. $CaO$ — basic oxide
8. $Na_2O$ — basic oxide
9. $NO_2$ — acidic oxide

The acidic oxides are $N_2O_3$, $Cl_2O_7$, $SO_2$ and $NO_2$.

Therefore, the required number is $4$.