A white solid imparts a violet colour to a Bunsen flame

CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

A white solid imparts a violet colour to a Bunsen flame. On being heated with concentrated

\text{H}_2\text{SO}_4

, the solid gives violet vapours that turns starch paper blue. The salt may be: (1)

\text{NaI}

(2)

\text{KI}

(3)

\text{CaBr}_2

(4)

\text{MgI}_2