A colouless solution of a compound gives a precipitate with `AgNO_(3)` solution but no precipitate with a solution of `Na_(2)CO_(3)`. The
action of concentrated `H_(2)SO_(4)` on the compound liberates a
suffocating reddish brown gas.
The compound is `:`

Options

A. `Ba(CH_(3)COO)_(2)`
B. `CaCl_(2)`
C. `NaI`
D. `NaBr`

Answer

4

Explanation

`Ag^(+)+Br^(-)rarrAgBrdarr("paly yellow")" "," "NaBr+Na_(2)CO_(3)rarr"No reaction"`
`2NaBr+2H_(2)SO_(4)rarrBr_(2)uarr(" reddish brown")+SO_(2)+SO_(4)^(2-)+2Na^(+)+2H_(2)O.`