How many ores are sulphide ores from the given ores ?
Azurite, chalcoite,iron pyrites,limonite.

Explanation

To determine how many of the given ores are sulphide ores, we will analyze each ore one by one.

1. **Azurite**:
- Azurite is a mineral with the formula CuCO3·Cu(OH)2.
- It is primarily a carbonate ore of copper, not a sulphide ore.
- Therefore, Azurite is **not** a sulphide ore.

2. **Chalcoite**:
- Chalcoite is an ore of copper with the formula Cu2S.
- It is a sulphide ore.
- Therefore, Chalcoite **is** a sulphide ore.

3. **Iron Pyrite**:
- Iron pyrite, also known as fool's gold, has the formula FeS2.
- It is a sulphide ore of iron.
- Therefore, Iron Pyrite **is** a sulphide ore.

4. **Limonite**:
- Limonite is an iron ore with the formula Fe2O3·3H2O.
- It is primarily an oxide ore, not a sulphide ore.
- Therefore, Limonite is **not** a sulphide ore.

Now, let's summarize the findings:
- Azurite: Not a sulphide ore
- Chalcoite: Is a sulphide ore
- Iron Pyrite: Is a sulphide ore
- Limonite: Not a sulphide ore

**Final Count of Sulphide Ores**:
- The ores that are sulphide ores from the given list are Chalcoite and Iron Pyrite.
- Therefore, the total number of sulphide ores is **2**.

### Answer: 2

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