[X] and [Y] are two nitrates of alkali metals [X] and [Y] on decomposition produces oxides and nitrites respectively. Here, [X] and [Y] refer to

Options

A. `LiNO_3` and `KNO_3`
B. `LINO_3` and `LiNO_3`
C. `KNO_3`and `LINO_3`
D. None of the above

Answer

To solve the question regarding the decomposition of two alkali metal nitrates [X] and [Y], we need to identify which alkali metals correspond to [X] and [Y] based on the products formed during their decomposition.

### Step-by-Step Solution:

1. **Understanding the Decomposition of Nitrates**:
- Alkali metal nitrates decompose upon heating. The general reactions are:
- Lithium nitrate (LiNO3) decomposes to form lithium oxide (Li2O) and nitrogen dioxide (NO2) and oxygen (O2).
- Other alkali metal nitrates (like sodium nitrate, potassium nitrate, etc.) decompose to form their respective nitrites (MNO2) and oxygen.

2. **Identifying [X]**:
- From the information above, we know that lithium nitrate (LiNO3) decomposes to produce lithium oxide (Li2O). Therefore, we can identify [X] as lithium (Li).

3. **Identifying [Y]**:
- The remaining alkali metal nitrates (sodium nitrate, potassium nitrate, etc.) decompose to produce nitrites. For example, potassium nitrate (KNO3) decomposes to form potassium nitrite (KNO2) and oxygen. Thus, we can identify [Y] as potassium (K) or any other alkali metal except lithium.

4. **Conclusion**:
- Therefore, [X] refers to lithium (Li) and [Y] refers to potassium (K).

### Final Answer:
- [X] = LiNO3 (Lithium Nitrate)
- [Y] = KNO3 (Potassium Nitrate)