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An inorganic Compound 'X' on treatment w...

An inorganic Compound 'X' on treatment with concentrated `H_2 SO_4` produces brown fumes and gives dark brown ring with `FeSO_4` in presence of concentrated `H_2 SO_4`. Also Compound 'X' gives precipitate 'Y', when its solution in dilute HCl is treated with `H_2 S` gas. The precipitate 'Y' on treatment with concentrated `HNO_3` followed by excess of `NH_4 OH` further gives deep blue coloured solution, Compound 'X' is

A

`Co(NO_3)_2`

B

`Pb(NO_2)_2`

C

`Cu(NO_3)_2`

D

`Pb(NO_3)_2`

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