In acidic medium, shows oxidising action as represented in the half reaction:

, , and are respectively:

Question

In acidic medium,  shows oxidising action as represented in the half reaction:

, ,  and  are respectively:

Canvas Classes · Accepted Answer

Step 1 — Identify the product A:
In acidic medium,  is reduced to :

So

Step 2 — Balance Cr:
2 Cr on each side ✓

Step 3 — Balance O (using ):
7 O on left → 7  on right →

Step 4 — Balance H (using ):
 H on right → 14  on left →

Step 5 — Balance charge (using ):
Left charge: 
Right charge:

Verify: 
- Cr:  (gain of 3e⁻ per Cr, 6e⁻ total) ✓
- Charge:  ✓

, , ,

Answer: Option (4)

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