How many of the following statements are correct for green vitriol?
1. It can be used for the preparation of Mohr’s salt.
2. It is a hydrated salt and its anhydrous form is white in colour.
3. The decomposition reaction of its anhydrous form is redox in nature.
4. It is used for making Fenton’s reagent used as a catalyst in organic chemistry
5. It can be used for the preparation of Potassium ferrocyanide.
6. It has same number of molecules of water of crystallization as white vitriol or blue vitriol.
7. It turns brownish-yellow on exposure to atmosphere.
8. Its aqueous solution is acidic in nature due to hydrolysis.
9. Out of the decomposition products of its anhydrous form, only one can turn acidified K 2 Cr 2 O 7 solution green.
Text Solution
Verified by Experts1
8
Sol. 1. FeSO 4 + (NH 4 ) 2 SO 4 + 6H 2 O 
FeSO 4 .(NH 4 ) 2 SO 4 .6H 2 O (Mohr salt)
2. Green vitriol is FeSO 4 .7H 2 O & its anhydrous form (FeSO 4 ) is white.
3. 
+ 
+ SO 3 (Redox)
4. Fact (Fenton’s reagent = FeSO 4 + H 2 O 2 )
5. 
+ 
K 4 [Fe(CN) 6 ]
6. White vitriol is ZnSO 4 .7H 2 O & Blue vitriol is CuSO 4 .5 H 2 O
7. Due to its oxidation to Fe 3+ .
8. Fe 2+ + 2H 2 O 
Fe(OH) 2 ↓ + 2H + (acidic solution)
9. Only SO 2 can turn acidified K 2 Cr 2 O 7 solution green.
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