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A monobasic acid of phosphorus , which r...

A monobasic acid of phosphorus , which reduces `HgCl_2` to balck Hg is

A

hypophosphorus acid

B

phosphoric acid

C

metaphosphoric acid

D

pyrophosphoric acid

Text Solution

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The correct Answer is:
To solve the question regarding the monobasic acid of phosphorus that reduces HgCl2 to black Hg, we can follow these steps: ### Step 1: Identify the Monobasic Acid of Phosphorus A monobasic acid of phosphorus is one that can donate one proton (H+) per molecule. The relevant acids of phosphorus include: - Phosphoric acid (H3PO4) - tribasic - Phosphorous acid (H3PO3) - dibasic - Hypophosphorous acid (H3PO2) - monobasic ### Step 2: Determine the Reducing Property Among these acids, hypophosphorous acid (H3PO2) is known for its reducing properties. It can donate electrons and reduce other substances. ### Step 3: Reaction with HgCl2 When hypophosphorous acid reacts with mercuric chloride (HgCl2), it reduces HgCl2 to elemental mercury (Hg), which appears as a black precipitate. The balanced chemical reaction can be represented as follows: \[ 2 \text{H}_3\text{PO}_2 + \text{HgCl}_2 \rightarrow 2 \text{Hg} + 2 \text{Cl}_2 + 2 \text{HCl} + \text{H}_3\text{PO}_4 \] ### Step 4: Conclusion From the above steps, we can conclude that the monobasic acid of phosphorus that reduces HgCl2 to black Hg is hypophosphorous acid (H3PO2). ### Final Answer The correct answer is **Hypophosphorous acid (H3PO2)**. ---
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