Chemistry - Metallurgy Question with Solution | TestHub

1. Brass (Cu + Zn) and Bronze (Cu + Sn) are important alloys of copper, so (A) is correct.

2. Froth flotation is mainly used for sulfide ores, and activator (e.g., CuSO₄) are added when required to improve flotation; hence (B) is considered correct as per the given key.

3. Magnetic separation is used to separate wolframite ($FeW{O}_4+MnW{O}_4$) from cassiterite (SnO₂) because wolframite is magnetic while cassiterite is non-magnetic. Hence, (C) is correct.

4. Pine oil, not cresol, is the common collector/frothing agent used in froth flotation; therefore (D) is incorrect.

Correct Answer: (A), (B) and (C)