1.

Heating which of the following salts in a dry test tube may cause a change in their colour ?

Answer»

`ZnCO_(3)` (WHITE)
`Co(NO_(3))_(2). 6H_(2)O` (red)
`FeSO_(4).6H_(2)O` (green)
`MnSO_(4)` (faint pink)

Solution :`UNDERSET("white")(ZnCO_(3)) underset(Delta)to ZnO +CO_(2) uarr . ZnO` in yellow when hot.
`Co(NO_(3))_(2).6H_(2)O underset(Delta)to COO ("black")+2NO_(2)uarr+(1)/(2)O_(2)uarr+6H_(2)O uarr`
`2FeSO_(4).6H_(2)O underset(Delta)to Fe_(2)O_(3) ("BROWN") +SO_(3) uarr + SO_(3)uarr +6H_(2)O uarr`
`underset(("faint pink"))(3MnSO_(4)) underset(Delta)to underset(("black"))(Mn_(3)O_(4))+2SO_(2)uarr +SO_(3)uarr`


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