1.

Zn(OH)_(2) undersetto(Delta)[X] Select the correctstatement (s) for the compound X.

Answer»

`X` on HEATING with cobalt nitrate gives green mass
`X` on heating alone, becomess yellow but turns white on cooling
Solution of `X` in dilute `HCl` gives bluish white// white precipitate with excees potassium ferrocyanide.
None Of These

Solution :`X` is `ZnO` which on heating with cobalt nitrate gives `ZnO. CoO`, the Rinmann's green
(B) It TURN yellow on heating and becomes white on cooling.
(C )` ZnCl_(2)` form bluish white//white precipitate. `Zn_(3)K_(2)[Fe(CN)_(6)]_(2)`
`3Zn^(2)+2K^(+)+2[Fe(Fe(CN)_(6)]^(4-)toK_(2)Zn_(3)[Fe(CM)_(6)]_(2)downarrow`
(D) `ZnO+2NaOHtoNa_(2)ZnO_(2)("Soluble complex")+H_(2)O`.
So, option`A,B& C` are correct.


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