Read the following statements :-
(I) Al has greater affinity than that of Cr, for oxygen
(II) Al can be used for reduction of `Fe_(2)O_(3)`
(III) Carbon is used for reduction of copper oxide (CuO)
(IV) `SnO_(2)` can be reduced by carbon
Choose the correct set of statement(s)

Options

A. I, III
B. I, II, IV
C. I, II, III
D. All of these

Answer

To solve the question, we need to evaluate each of the statements provided and determine which ones are true.

**Step 1: Analyze Statement I**
Statement I: "Al has greater affinity than that of Cr, for oxygen."
- Aluminum (Al) has a higher affinity for oxygen compared to chromium (Cr). This is supported by the electrochemical series, where aluminum is more reactive and can displace chromium from its oxide.
- **Conclusion**: This statement is **true**.

**Step 2: Analyze Statement II**
Statement II: "Al can be used for reduction of Fe2O3."
- Aluminum can indeed reduce iron(III) oxide (Fe2O3) to iron (Fe). This reaction is known as thermite reaction, where aluminum acts as a reducing agent.
- **Conclusion**: This statement is **true**.

**Step 3: Analyze Statement III**
Statement III: "Carbon is used for reduction of copper oxide (CuO)."
- Copper oxide (CuO) is a self-reducing agent, meaning it can reduce itself without the need for an external reducing agent like carbon. Therefore, carbon is not necessary for this reduction.
- **Conclusion**: This statement is **false**.

**Step 4: Analyze Statement IV**
Statement IV: "SnO2 can be reduced by carbon."
- Tin(IV) oxide (SnO2) can be reduced by carbon because carbon is more reactive than tin in the electrochemical series. Hence, carbon can effectively reduce SnO2 to tin (Sn).
- **Conclusion**: This statement is **true**.

**Final Evaluation**:
- Statement I: True
- Statement II: True
- Statement III: False
- Statement IV: True

The correct set of statements is **I, II, and IV**.

**Answer**: The correct answer is the set of statements I, II, and IV.

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