The process of calcination and roasting is carried out in reverberatory furnace.

Answer

**Step-by-Step Solution:**

1. **Understanding Calcination:**
- Calcination is a thermal treatment process where metal ores are heated in the absence of air or with limited air supply. This process converts the ore into its oxide form.
- The temperature used in calcination is below the melting point of the metal to prevent melting.

2. **Understanding Roasting:**
- Roasting is similar to calcination but involves heating the ore in the presence of excess air or oxygen.
- This process results in the formation of metal oxides from the ores.

3. **Identifying the Furnace Used:**
- Both calcination and roasting are processes that require controlled heating.
- A reverberatory furnace is commonly used for these processes. This type of furnace allows for the isolation of the material being processed from the fuel while still being in contact with combustion gases.

4. **Conclusion:**
- Since both calcination and roasting are conducted in a reverberatory furnace, the statement in the question is true.

**Final Answer:**
- The statement that the process of calcination and roasting is carried out in a reverberatory furnace is **True**.

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