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The p-Block Elements

Short Answer Type

491. The brown colour of an acidified dilute solution of iodine in aqueous potassium iodide is intensified by the addition of a nitrite but is discharged by the addition of sulphite.

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492. With what neutral molecule is CIO^– iso– electronic?

The term valence isoelectronic is used when these molecular entities have the same number of valence electrons or a similar electron configuration, but may have a different number of atoms or a different bonding.
valence electron of CIO^–. is 14= 7+6+1(negtive charge)
valence electron of ClF is 14 =7+7

ClF is isoelectronic with ClO^–.

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