Out of PbS and `PhCO _ 3 ` (ores of lead), which one is concentrated by froth floatation process preferably ?

Explanation

To determine which ore, PbS (lead sulfide) or PbCO3 (lead carbonate), is preferably concentrated by the froth flotation process, we need to analyze the properties of these ores and how they interact with the froth flotation technique.

### Step-by-Step Solution:

1. **Understanding Froth Flotation Process**:
- Froth flotation is a method used for the concentration of ores based on the differences in their hydrophobicity (water-repelling nature). It involves adding chemicals (collectors) that selectively bind to the desired mineral, making it hydrophobic, and allowing it to attach to air bubbles and rise to the surface.

2. **Analyzing the Ores**:
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