Question

Which halogen in its reference state will have greatest absolute entropy per mole?

• A. Fluorine
• B. Chlorine
• C. Bromine
• D. Iodine

Answer 1

The correct option is B Chlorine

In question reference state means standard state.

So, standard states of all halogens are

Fluorine $\to$ Gaseous

Chlorine $\to$ Gaseous

Bromine $\to$ liquid

Iodine $\to$ Solid

We know the entropy of Gaseous state is higher than liquid and solid.

And we also know that entropy depends on molar mass so the molar mass of chlorine is higher than fluorine so the absolute entropy per mole of chlorine is highest.

Answer: Chlorine