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JEE Main
Exam
JEE Main
Subject
Chemistry
Chapter
Practical Chemistry

JEE Main · Chemistry · Practical Chemistry

A red solid is insoluble in water. However, it becomes soluble if...

A red solid is insoluble in water. However, it becomes soluble if some KIKI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is

Options

  1. AHgI2Hg{I}_{2}
  2. BHgOHgO
  3. CPb3O4P{b}_{3}{O}_{4}
  4. D(NH4)2Cr2O7{\left(N{H}_{4}\right)}_{2}C{r}_{2}{O}_{7}

Correct answer

A. HgI2Hg{I}_{2}

Step-by-step solution

HgI2Hg{I}_{2} is orange-red in appearance and hardly soluble in water. It dissolves in excess of I−I^{-} giving complexes HgI3−Hg{I}_{3}^{-} and HgI42−Hg{I}_{4}^{2 -} . Violet fumes are liberated due to the release of Iodine gas upon heating.
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