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(D) $1$. $Hg$ does not form an amalgam with iron $(Fe)$,which is why iron containers are used to store mercury. Thus,statement $A$ is incorrect.$2$. $

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Oxysalts of mercury are thermally unstable.

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(D) $1$. $Hg$ does not form an amalgam with iron $(Fe)$,which is why iron containers are used to store mercury. Thus,statement $A$ is incorrect.$2$. $Hg$ vapour is highly poisonous. Thus,statement $B$ is incorrect.$3$. In mercurous compounds,mercury exists as the dimer $Hg_2^{2+}$,where each $Hg$ atom is monovalent,but the species is diatomic,not monoatomic. Thus,statement $C$ is incorrect.$4$. Oxysalts of mercury (like $HgSO_4$,$Hg(NO_3)_2$) are thermally unstable and decompose upon heating to give $Hg$ metal,oxygen,and other products. Thus,statement $D$ is correct.

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