1.

Hg(NO_(3))_(2) overset(Delta) toW + X + O_(2) X + H_(2)O rarr HNO_(2) + HNO_(3) W + HNO_(3) rarr Y + NO + H_(2)O Y + Na_(2)S_(2)O_(3) ("excess") rarr 2 + NaNO_(3)

Answer»

`{:("W"," X","Y","Z"),(Hg,N_(2)O,Hg(NO_(3))._(2),Na_(2)[Hg(S_(2)O_(3))_(2)]):}`
`{:("W"," X","Y","Z"),(Hg,NO,Hg(NO_(3))._(2),Na[Hg(S_(2)O_(3))_(2)]):}`
`{:("W"," X","Y","Z"),(Hg,NO_(2),Hg(NO_(3))._(2),Na_(2)[Hg(S_(2)O_(3))_(2)]):}`
`{:("W"," X","Y","Z"),(Hg,N_(2)O_(3),Hg(NO_(3))._(2),Na_(3)[Hg(S_(2)O_(3))_(2)]):}`

Solution :`Hg(NO_(3))_(2)overset(DELTA)rarrHg(1)+underset((W))(NO_(2)uarr) +underset((X))(O_(2)uarr)`
`2NO_(2) +H_(2)O rarr HNO_(2) +HNO_(3)`
`underset((W))(Hg)+4HNO_(3) overset(Delta)rarr underset((Y))(Hg(NO_(3))_(2)) +2NO uarr+2H_(2)O`
`Hg(NO_(3))_(2)+underset(("Soluble"))(Na_(2)S_(2)O_(3))rarr Na_(2) [Hg(S_(2)O_(3))_(2)] +2NaNO_(3)`


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