Metal Which of the following two combination are correct metal gas evolved 1 copper yes 2Iron yes 3 magnesium 4zinc A 1and3 B 1and4 C 2and3 d 2and4
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Explanation:
FeSO
4
, SO
2
, SO
3
, Fe
2
O
3
, FeCl
3
2FeSO
4
→SO
2
+SO
3
+Fe
2
O
3
B is SO
2
, C is SO
3
and D is Fe
2
O
3
.
K
2
Cr
2
O
7
+3SO
2
+H
2
SO
4
→K
2
SO
4
+Cr
2
(SO
4
)
3
+H
2
O
Cr
2
(SO
4
)
3
is green in colour.
Fe
2
O
3
+6HCl→2FeCl
3
+3H
2
O
E is FeCl
3
which is a lewis acid and exists as dimer.
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