Which of the following is/are correct ?

Options

A. Sodium thiosulphate is called hypo.
B. Sodium peroxide is callede oxone.
C. Potassium carbonate is calledparl ash.
D. Sodium nitrate is called Indian nitre.

Answer

To determine which of the given statements about certain chemical compounds is correct, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option A: Sodium thiosulphate is called hypo.**
- Sodium thiosulphate has the chemical formula Na2S2O3. It is indeed commonly known as "hypo" and is widely used in photography and as a reducing agent in various chemical reactions.
- **Conclusion:** This statement is **correct**.

2. **Option B: Sodium peroxide is called ozone.**
- Sodium peroxide has the chemical formula Na2O2. However, it is not called ozone. Ozone is a different compound with the formula O3. Sodium peroxide is known for its use as an oxidizing agent but does not share the name "ozone."
- **Conclusion:** This statement is **incorrect**.

3. **Option C: Potassium carbonate is called perlash.**
- Potassium carbonate has the formula K2CO3. It is indeed commonly referred to as "perlash." This compound is used in various applications, including as a fertilizer and in glass production.
- **Conclusion:** This statement is **correct**.

4. **Option D: Sodium nitrate is called Indian niter.**
- Sodium nitrate has the formula NaNO3. It is commonly known as "chili saltpeter" due to its large deposits found in Chile. While it may have other names, "Indian niter" is not a recognized common name for sodium nitrate.
- **Conclusion:** This statement is **incorrect**.

### Final Answer:
- The correct options are **A (Sodium thiosulphate is called hypo)**, **C (Potassium carbonate is called perlash)**.

### Summary of Correctness:
- **Option A:** Correct
- **Option B:** Incorrect
- **Option C:** Correct
- **Option D:** Incorrect