A gas 'X' is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of colourless gas Y , X and Y are :

Options

A. `X=CO_2 , Y=Cl_2`
B. `X=Cl_2, Y=CO_2`
C. `X=Cl_2, Y=H_2`
D. `X=H_2, Y=Cl_2 `

Answer

C

Explanation

`underset((X))(Cl_2) + H_2O to HCl + HOCl`
`AgNO_3 + HCl to underset ("White ppt")(AgCl) + HNO_3 `
`Mg+2HCl to Mg Cl_2 + underset((Y))(H_2)uarr`