Carborundum on heating with caustic soda in presence of air produces

Options

A. `Na_(2)SiO_(4)+H_(2)`
B. `Na_(2)SiO_(2)+H_(2)`
C. `Na_(2)SiO_(3)+H_(2)`
D. `Na_(2)SiO_(3)+Na_(2)CO_(3)+H_(2)O`

Answer

To solve the question regarding the products formed when carborundum (silicon carbide, SiC) is heated with caustic soda (sodium hydroxide, NaOH) in the presence of air, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The main reactants in this reaction are carborundum (SiC) and caustic soda (NaOH). Additionally, oxygen from the air is also a reactant.

2. **Write the Chemical Reaction**:
- When SiC is heated with NaOH and oxygen, the reaction can be represented as:
\[ SiC + 4NaOH + 2O_2 \rightarrow Na_2SiO_3 + Na_2CO_3 + 2H_2O \]
- Here, silicon carbide reacts with sodium hydroxide and oxygen to produce sodium silicate (Na2SiO3), sodium carbonate (Na2CO3), and water (H2O).

3. **Identify the Products**:
- From the balanced chemical equation, the products formed are:
- Sodium silicate (Na2SiO3)
- Sodium carbonate (Na2CO3)
- Water (H2O)

4. **Evaluate the Options**:
- Now, we can compare our derived products with the given options:
- Option 1: Na2SiO4 + H2 (Incorrect)
- Option 2: Na2SiO2 + H2 (Incorrect)
- Option 3: Na2SiO3 + H2 (Incorrect)
- Option 4: Na2SiO3 + Na2CO3 + H2O (Correct)

5. **Conclusion**:
- The correct answer to the question is that heating carborundum with caustic soda in the presence of air produces sodium silicate, sodium carbonate, and water.

### Final Answer:
The products formed are: **Na2SiO3 + Na2CO3 + H2O**.

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