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A red solid is insoluble in water. Howev...

A red solid is insoluble in water. However, it becomes soluble if some Kl 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 test tube. The red solid is

A

`(NH_4)_2 Cr_2 O_7`

B

`HgI_2`

C

HgO

D

`Pb_2O_4`

Text Solution

Verified by Experts

The correct Answer is:
B
The reactions involved are.
`underset (" Scarlet red ") (HgI_2) + KI to K_2 underset ("Soluble") ([HgI_4]), HgI_2 to underset (" metal droplets") (Hg) + underset (" violet fumes") (I_2)`
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BRILLIANT PUBLICATION-THE D- AND F-BLOCK ELEMENT-LEVEL-II (ASSERTION-REASON TYPE)
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