Which one of the following is a coinage metal
- A. Pd
- B. Cu
- C. Cd
- D. Hg
Explanation
Copper, silver and gold form group IB and are called the coinage metals because their unreactivity and durability made them the traditional choice for currency. Palladium is a platinum group metal, and cadmium and mercury sit in group IIB with completely filled d subshells. All four are d block elements, which is what makes the distractors plausible.
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