Choose the correct code regarding Roasting process.
(I) It is the process of heating ore in air to obtain the oxide
(II) It is an exothermic process
(III) It is used for hydrated oxide and oxysalt ore
(IV) It is used after the concentration of ore

Options

A. I, II and III
B. I, II and IV
C. I, III and IV
D. I, II, III and IV

Answer

To solve the question regarding the roasting process, we will analyze each statement provided and determine whether they are correct or not.

**Step 1: Analyze Statement I**
- Statement I: "It is the process of heating ore in air to obtain the oxide."
- **Analysis**: This statement is true. Roasting involves heating ores, particularly sulfide ores, in the presence of air (oxygen) to convert them into their corresponding metal oxides.

**Step 2: Analyze Statement II**
- Statement II: "It is an exothermic process."
- **Analysis**: This statement is also true. The roasting process releases heat, which classifies it as an exothermic reaction.

**Step 3: Analyze Statement III**
- Statement III: "It is used for hydrated oxide and oxysalt ore."
- **Analysis**: This statement is incorrect. Roasting is primarily used for sulfide ores and is not typically used for hydrated oxides and oxysalts. Hydrated ores can be converted to anhydrous forms through roasting, but oxysalts are not a primary focus of this process.

**Step 4: Analyze Statement IV**
- Statement IV: "It is used after the concentration of ore."
- **Analysis**: This statement is true. Roasting is performed after the concentration of ores, which involves the removal of impurities.

**Conclusion:**
Based on the analysis:
- Statement I: True
- Statement II: True
- Statement III: False
- Statement IV: True

Thus, the correct statements regarding the roasting process are I, II, and IV. The correct code is therefore **B (I, II, IV)**.