356 " mg of " an alloy of Zn and Cd is precipitated as ZnS and CdS by `H_(2)S`. The mixed precipitate sulphur. The filterate is acidified and the divalent `Fe^(2+)` reqruied 1.6 millimoles of `KMnO_(4)` Find the percentage of Cd in the alloy. `(Cd=112,Zn=65.4)`

Explanation

To solve the problem of finding the percentage of cadmium (Cd) in the alloy of zinc (Zn) and cadmium (Cd) that was precipitated as ZnS and CdS, we can follow these steps:

### Step 1: Understand the Given Data
We have:
- Mass of the alloy = 356 mg
- Amount of KMnO4 used = 1.6 millimoles
- Molar mass of Zn = 65.4 g/mol
- Molar mass of Cd = 112 g/mol
...