Which of the followinngg species is/are formed when conc. `HNO_(3)` is added to conc. Sulphuric acid?

Options

A. `NO_(3)^(-)`
B. `NO_(2)^(+)`
C. `NO^(+)`
D. `HSO_(4)^(-)`

Answer

To solve the question of which species are formed when concentrated HNO3 (nitric acid) is added to concentrated H2SO4 (sulfuric acid), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are concentrated nitric acid (HNO3) and concentrated sulfuric acid (H2SO4).

2. **Understand the Nature of the Acids**:
- Sulfuric acid (H2SO4) is a strong acid, while nitric acid (HNO3) is a weaker acid in comparison. This means that sulfuric acid can donate protons (H+) more readily than nitric acid.

3. **Reaction Mechanism**:
- When HNO3 is added to H2SO4, the stronger acid (H2SO4) will donate a proton (H+) to the weaker acid (HNO3).
- The nitric acid will act as a base in this scenario, accepting the proton.

4. **Formation of Products**:
- The reaction can be represented as follows:
\[ \text{HNO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{NO}_2^+ + \text{HSO}_4^- + \text{H}_2\text{O} \]
- Here, the nitric acid loses a proton and forms the nitronium ion (NO2+) and the bisulfate ion (HSO4-).

5. **Final Products**:
- The species formed are NO2+ (nitronium ion) and HSO4- (bisulfate ion).

6. **Conclusion**:
- Based on the reaction, the correct species formed when concentrated HNO3 is added to concentrated H2SO4 are NO2+ and HSO4-.

### Answer:
The species formed are NO2+ and HSO4-.