Applications of zinc – Identify where zinc is not typically used: Zinc has multiple industrial uses. Which of the following is NOT a common application area for zinc or its compounds?

Introduction / Context:
Zinc is a versatile nonferrous metal used in galvanizing, die casting, and as oxide or other salts in chemical applications. Understanding where zinc is employed versus where other alloy systems dominate avoids design and material selection errors.

Given Data / Assumptions:

• Zinc is commonly used in die-casting alloys (e.g., Zamak series).
• Zinc oxide (ZnO) is widely used as a white pigment and in rubber compounding.
• Bronzes are traditionally copper–tin based alloys, possibly with small additions of other elements but not primarily zinc.

Concept / Approach:
Bronze is primarily a Cu–Sn alloy (with optional additions such as Pb, P, Al, Si). In contrast, copper–zinc alloys are called brasses. Therefore, “zinc as an alloying element in various bronzes” is not typical nomenclature or practice; zinc belongs with brasses, not bronzes. As for corrosion protection, sacrificial anodes include zinc, magnesium, or aluminum in many aqueous systems, but the statement specifically about “in boiler” service is not the standard or typical practice highlighted in fundamentals MCQs; the unambiguously incorrect association is zinc being an alloying element in bronzes.

Step-by-Step Solution:
List common zinc uses: galvanizing, die casting, ZnO pigments.Recall alloy families: brass (Cu–Zn) vs. bronze (Cu–Sn).Identify the mismatch: zinc in bronzes is not a standard categorization.

Verification / Alternative check:
Materials handbooks classify bronzes by tin, aluminum, silicon, or phosphorous additions. Zinc leads to brasses, not bronzes.

Why Other Options Are Wrong:

• Die casting alloys: zinc-based die-cast alloys are very common.
• ZnO pigments: well-established application (zinc white).
• Anodes for corrosion protection: zinc is a classic sacrificial anode material in many aqueous environments (though specific boiler practice can vary).

Common Pitfalls:
Confusing bronze with brass; both are copper alloys but with different principal alloying elements.

Final Answer:
As an alloying element in various bronzes