1.

A student was given a sample of colourless solution containing three cations and was asked to identify the cations.Student carried out a series of reactions as given below. Precipitates 'A','B' and 'C' are respectively :

Answer»

`Al(OH)_3 , BaSO_4 and AgCl`
`AgCl, BaSO_4 and Zn(OH)_2`
`AgCl, CA(OH)_2 and ZnSO_4`
`ZnCl_2, BaSO_4 and Al(OH)_3`

SOLUTION :
`Ag^(+)+Cl^(-)toAgCldarr("white") , 3AgCl+Na_3AsO_3 to Ag_3AsO_3 darr ("yellow")+3NaCl`
`Ba^(2+)+SO_4^(2) to BaSO_4darr ("white") , Ba^(2+)` SALTS give apple green colour to the Bunsen FLAME.
`Zn^(2+)+2NH_3 + 2H_2O to Zn(OH)_2darr ("white")+2NH_4 uarr`
`Zn(OH)_2darr + 4NH_4 HARR [Zn(NH_3)_4]^(2+)+2OH^(-)`


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