Question

Write the balanced chemical equation for the following:
(i). Silver chloride is treated with aaqueous sodium cyanide and the product thus formed is allowed to react with zinc in an alkaline medium.
(ii). Cobalt (II) solution reacts with `KNO_2` in acetic acid medium.

Answer 1

(i). Silver goes into the complex, and then it is displaced with zinc.
`AgCl+2NaCNtoNaCl+Na[Ag(CN)_2]`
`2Na[Ag(CN)]+2ZntoNa_2[Zn(CN)_4]+2Agdarr`
(ii). Yellow precipitate is formed.
`KNO_2+CH_3COOHtoCH_3COOK+KNO_2`
`CoCL_2+2KNO_2toCo(NO_2)_2+2KCl`
`Co(NO_2)_2+2KNO_2toCo(NO_2)_3+NO+H_2O`
`Co(NO_2)_3+3KNO_2+K_3[Co(NO_2)_6]`