What happens when:
(a). Green vitriol is strongly heated.
(b). Malachite is made to react with dilute `H_(2)SO_(4)`
(c). Copper sulphate is exposed to air for longer period. ltBrgt (d). Lunar caustic is made to react with sodium hydroxide and then product is dried.
(e). Silver nitrate reacts with excess iodine.
(f). Potassium dichromate reacts with cold and concentrated `H_(2)SO_(4)`.

Explanation

(a). `FeSO_(4).7H_(2)Ounderset(H_(2)O)overset(300^(@)C)toFeSO_(4)underset("tempt")overset(high)toFe_(2)O_(3)+SO_(2)+SO_(3)`
(b) `CuCO_(3).Cu(OH)_(2)+2H_(2)SO_(4)to2CuSO_(4)+3H_(2)O+CO_(2)uarr`
(c) `CuSO_(4).5H_(2)Ounderset("ettloresces")overset(air)toCuSO_(4).3H_(2)O`
(d) `2AgNO_(3)+2NaOHtoAg_(2)Odarr("black")+2NaNO_(3)+H_(2)O` ltbr (e). `5AgNO_(3)+3I_(2)("excess")+H_(2)OtoHIO_(3)+5AgIdarr("yellow")+5HNO_(3)`
(f) `K_(2)Cr_(2)O_(7)+2H_(2)SO_(4)(conc.&" "cold)to2CrO_(3)(red)+2KHSO_(4)+H_(2)O`