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Question: Answered & Verified by Expert
A monobasic acid of phosphorus, which reduces HgCl2 to balck Hg is
Chemistryp Block Elements (Group 15, 16, 17 & 18)NEET
Options:
  • A hypophosphorus acid
  • B phosphoric acid
  • C metaphosphoric acid
  • D pyrophosphoric acid
Solution:
2315 Upvotes Verified Answer
The correct answer is: hypophosphorus acid
H3PO2 shows reducing properties.
H 3 PO 2  + 4  HgCl 2  + 2  H 2 O→2  Hg 2 Cl 2  + 4 HCl +  H 3 PO 4
2  Hg 2 Cl 2  +  H 3 PO 2  + 2  H 2 O→4 Hg + 4 HCl +  H 3 PO 4

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