Question

``X'' is an oxoanion of the lightest element of group 17 (in the periodic table). The metal is in +6 oxidation state in ``X''. The color of the potassium salt of X is

• A. purple
• B. green
• C. orange
• D. yellow

Hint:

For halogen oxoanions, always check the oxidation state to correctly identify the species.

Answer 1

The Correct Option is B

Step 1: Identification of the element.
The lightest element of group 17 is chlorine. An oxoanion of chlorine in which the oxidation state of chlorine is +6 corresponds to the chlorate ion (ClO$_3^-$).
Step 2: Potassium salt of the oxoanion.
The potassium salt of chlorate is potassium chlorate (KClO$_3$). Potassium chlorate is known to appear greenish in crystalline form under standard conditions.
Step 3: Conclusion.
Hence, the correct color of the potassium salt of X is green.