Q.

Which of the following elements is not radioactive?

A. Radium
B. Plutonium
C. Zirconium
D. Uranium
Answer» C. Zirconium
Explanation: Zireonium is a lustrous, grey- white, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and pacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion.
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