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A red solid is insoluble in water. However it becomes soluble if some KI 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. AHgI ₂
  2. BHgO
  3. CPb ₃ O ₄
  4. D( NH ₄ )₂ Cr ₂ O ₇

Correct answer

A. HgI ₂

Step-by-step solution

(insoluble) HgI ₂ + KI (soluble) K ₂ HgI ₄ On heating HgI ₂ decomposes as HgI ₂ Hg + I ₂

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