A red solid is insoluble in water but soluble in the presence of

CHEMISTRY · Single correct · ICSE · Chemistry · Analytical Chemistry · Analytical Chemistry

Problem

\text{KI}

. Heating the red solid in a test tube results in the formation of yellow sublimate in the part of the test tube. The red solid is: (1)

\text{Pb}_3\text{O}_4

(2)

\text{HgI}_2

(3)

\text{HgO}

(4)

(\text{NH}_4)_2\text{Cr}_2\text{O}_7