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(B) The red solid is $HgI_2$ (Mercury$(II)$ iodide).$1$. $HgI_2$ is insoluble in water but dissolves in $KI$ solution due to the formation of a solubl

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$HgI_2$

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(B) The red solid is $HgI_2$ (Mercury$(II)$ iodide).$1$. $HgI_2$ is insoluble in water but dissolves in $KI$ solution due to the formation of a soluble complex: $HgI_2 + 2KI \rightarrow K_2[HgI_4]$.$2$. Upon heating,$HgI_2$ decomposes to form mercury metal and iodine vapor: $HgI_2 \xrightarrow{\Delta} Hg + I_2(g)$.$3$. The iodine vapor appears violet,and the mercury metal forms droplets on the cooler parts of the test tube.

$A$ red solid is insoluble in water,but it becomes soluble if a small amount of $KI$ is added to the water. If this red solid is heated in a test tube,it produces a violet-colored vapor and some metallic droplets are observed on the cooler parts of the test tube. This red solid is........

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