Question

One litre of an acidified solution of KMnO4
containing 15.8 g KMnO, is decolorised by
passing sufficient amount of SO2. If so, is
produced by roasting of iron pyrite (FeS 2).
The amount of pyrite required to produce the
necessary amount of so, will be
(a) 15.8 g Fesz (b) 15.0 g Fes
(c) 7.5 g Fesz
(d) 7.9 g Fesz
If an e is revolving in the first bohr orbit of​

Answer 1

Answer:

reaction for the roasting of FeS

2

is as follows:

4×120

4FeS

2 +11O

2→2F O

3 +

8×64

8SO

2

Equivalents of KMnO

4=31.6

15.1 L=0.5 eq. of KMnO

4 =0.5eq of SO

2 =0.5×

2

64g of SO

2=16 g of SO

2

8×64 g of SO

2

is produced from 2×120 g of FeS

2

. (from the equation above)

∴16 g of SO

2

is produced from

8×64

4×120 ×64=15g