In how many of the following reactions, one of the products is obtained as a yellow precipitate ?
`Ba^(2+)+CrO_4^(2-)to` products
`Hg^(2+)+Co^(2+)+4SCN^(-)to` products
`Bi^(3+)+C_6H_3(OH)_3to` products
`Mn(OH)_2 darr+O_2to` products
`Zn^(2+)+2HPO_4^(2-)to` products
`NH_4^(+)+[PtCl_6]^(2-)to` products

Answer

3

Explanation

`Ba^(2+)+CrO_4^(2-)toBaCrO_4darr` (yellow)
`Hg^(2+)+Co^(2+)+4SCN^(-)toCo[Hg(SCN)_4]darr` (deep blue )
`Bi^(3+)+C_6H_3(OH)_3toBi(C_6H_3O_3)darr(yellow)+3H^(+)`
`2Mn(OH)_2darr+O_2to2MnO(OH)_2darr`(brown)
`Zn^(2+)+2H PO_4^(2-)to Zn_3(PO_4)_2darr(white) + 2H^(+)`
`2NH_4^(+)+[PtCl_6]^(2-)to(NH_4)_2[PtCl_6]darr` (yellow)