Mark the correct statements : (a) \( \mathrm{Hg} \) forms an amalgam with iron \( \mathrm{P} \) ...

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Mark the correct statements :
(a) \( \mathrm{Hg} \) forms an amalgam with iron
\( \mathrm{P} \)
(b) \( \mathrm{Hg} \) vapour is non-poisonous
W.
(c) \( \mathrm{Hg} \) is mono atomic and monovalent in mercurous compound
(d) Oxysalts of mercury are thermally unstable
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