MHT CET202521 Apr 2025Morning ShiftChemistryRedox ReactionsActual
Which is NOT correct regarding stock notation?
Options
- AHg ₂ (I) Cl ₂ is reduced form of Hg (II) Cl ₂
- BHg (II) Cl ₂ is oxidised form of Hg ₂ (I) Cl ₂
- CIt helps to identify whether species is present in oxidised form or reduced form
- DAurous chloride is written as Au (III) Cl ₃
Correct answer
D. Aurous chloride is written as Au (III) Cl ₃
Step-by-step solution
The stock notation uses Roman numerals to indicate the oxidation state of the metal in a compound. In Hg₂Cl₂ , mercury has oxidation state +1 (since 2 (+1) + 2 (-1) = 0 ), denoted Hg(I) . In HgCl₂ , mercury has oxidation state +2 (since +2 + 2 (-1) = 0 ), denoted Hg(II) . Since +1 is a lower oxidation state than +2, Hg₂Cl₂ is the reduced form of HgCl₂ , confirming statement A is correct. If Hg₂Cl₂ is reduced, then HgCl₂ is its oxidized form, validating statement B. Stock notation indicates the oxidation state, allo