A mixture of two white substances was dissolved in water.On passing `Cl_2` gas through the solution a deep brown colour is developed. Addition of `BaCl_2` solution to the original solution gives a white precipitate.Addition of a large amount of NaOH solution to the original solution gives a white precipitate, whose suspension in water is used as an antacid.The mixture gives golden yellow colour flame. The mixture contains :

Options

A. `Na^(+), Mg^(2+) Br^(-) and SO_4^(2-)`
B. `Na^(+), Ca^(2+) , Br^(-) and SO_4^(2-)`
C. `Na^+ , Al^(3+) , Br^(-) and SO_4^(2-)`
D. `Na^(+),Zn^(2+) , Br^(-) and SO_4^(2-)`

Answer

A

Explanation

`2Br^(-)+Cl_2toBr_2uarr`(reddish brown) + `2Cl^(-) , SO_4^(2-)+BaCl_2toBaSO_4 darr`(white)+`2Cl^-`
`Mg^(2+)+2NaOH to Mg(OH)_2darr` (white) + `2Na^+`
Suspension of `Mg(OH)_2` in water is used as antacid & sodium salt give golden yellow colour flame.