Question:
In the reaction $NaOH + S → A + Na₂S + H₂O$; A is ________.
In the reaction $NaOH + S → A + Na₂S + H₂O$; A is ________.
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In the reaction $NaOH + S → A + Na2S + H2O$; A is ____.
Updated On: Apr 15, 2026
- $Na_{2}SO_{4}$
- $Na_{2}SO_{3}$
- $Na_{2}S$
- $Na_{2}S_{2}O_{3}$
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The Correct Option is B
Solution and Explanation
Step 1: Reaction Analysis
This is a disproportionation reaction of sulfur in hot concentrated alkali.
Step 2: Equation
The balanced chemical equation is: $$6NaOH + 3S \rightarrow Na_{2}SO_{3} + 2Na_{2}S + 3H_{2}O$$
Step 3: Identification
Comparing with the given equation, A corresponds to sodium sulfite ($Na_{2}SO_{3}$).
Final Answer: (B)
This is a disproportionation reaction of sulfur in hot concentrated alkali.
Step 2: Equation
The balanced chemical equation is: $$6NaOH + 3S \rightarrow Na_{2}SO_{3} + 2Na_{2}S + 3H_{2}O$$
Step 3: Identification
Comparing with the given equation, A corresponds to sodium sulfite ($Na_{2}SO_{3}$).
Final Answer: (B)
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