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  4. Mercury on heating with aqua-regia gives :

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Q. Mercury on heating with aqua-regia gives :

NTA AbhyasNTA Abhyas 2020The d-and f-Block Elements

Solution:

Aqua regia is a mtextxture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3

$3\text{H}\text{g}+2\text{H} \text{N} \text{O}_{3}+6\text{H}\text{C}\text{l}$

$ \rightarrow \, \, 3\text{H}\text{g}\text{C}\text{l}_{2}+2\text{N}\text{O}+4\text{H}_{2}\text{O}$