MCQ
इस अभिक्रिया में

' $A ^{\prime}$ है :
  • A
    $Cu _2 Cl _2$
  • B
    $H _3 PO _2$ and $H _2 O$
  • C
    $H ^{+} / H _2 O$
  • D
    $HgSO _4 / H _2 SO _4$

Answer

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