$Hg {({NO}_{3})}_{2} \overset{Δ}{⟶} W + X + O_{2} X + H_{2} O ⟶ {HNO}_{2} + {HNO}_{3} W + {HNO}_{3} ⟶ Y + NO + H_{2} O Y + {Na}_{2} S_{2} O_{3} (excess) ⟶ Z + {NaNO}_{3}$

Moderate

A

W - Hg, X - N₂O, Y - $Hg {({NO}_{3})}_{2}$ Z - ${Na}_{2} [Hg {(S_{2} O_{3})}_{2}]$
B

W - HgO, X - NO Y - $Hg {({NO}_{3})}_{2}$ Z - $Na [Hg {(S_{2} O_{3})}_{2}]$
C

W - Hg X -NO₂ , Y - $Hg {({NO}_{3})}_{2}$ Z - ${Na}_{2} [Hg {(S_{2} O_{3})}_{2}]$
D

$W - Hg, X - N_{2} O_{3}, Y - Hg {({NO}_{3})}_{2} Z - {Na}_{3} [Hg {(S_{2} O_{3})}_{2}]$

Solution

$Hg {({NO}_{3})}_{2} \overset{Δ}{⟶} Hg (l) + {NO}_{2} ↑ + O_{2} ↑ (W) (X)$
$2 {NO}_{2} + H_{2} O ⟶ {HNO}_{2} + {HNO}_{3} Hg + 4 {HNO}_{3} \overset{Δ}{⟶} Hg {({NO}_{3})}_{2} + 2 NO ↑ + 2 H_{2} O (w) (dil .) (Y) Hg {({NO}_{3})}_{2} + {Na}_{2} S_{2} O_{3} ⟶ {Na}_{2} [Hg {(S_{2} O_{3})}_{2}] + 2 {NaNO}_{3} (Soluble) (Z)$

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