Question

The element which forms ions in dimeric state is

• A. mercury
• B. nickel
• C. iron
• D. cadmium

Hint:

Hg$_2^{2+}$ is a classic example of a metal-metal bonded ion.

Answer 1

The Correct Option is A

Understanding the Concept: Some metals form metal-metal bonds resulting in dimeric ions.

Step 1: Mercury behavior
Mercury forms Hg$_2^{2+}$ ion (dimeric ion).

Step 2: Structure
Two Hg atoms are bonded together: \[ Hg - Hg \] Final Answer:
Thus, mercury forms dimeric ions.