(viii) (Pt (NH3)C13)
(ix) [Xe 0613-
(x) Fe (CO)3
3. What is the O.N. of sulphur in the following ?
(I) (a) Nazs
(b) H2SO4 (c) SO2 (d) Sg
© Na2S406 (1) S03
(g) SO} (h) S203
(i) Cas
( ) SF2
(II) Calculate the O.N. of oxygen in OF2, Na2O2, Na2O, KO2
4. Indicate the substances that are oxidised and reduced in the followi
(a) 2CuSO4 + 4KI
2Cul + 12 + 2K2SO4
(b) 2Na2S + 4HCl + SO2 = 4NaCl + 3 + 2H20
(c) Si + 2KOH + H20 = K2SiO3 + 2H2
(d) 5Cl2 + 12 + 6H20 2103 + 10CP + 12H+
(k) S2-
Answers
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Oxidation state of S
2
O
4
2−
2(x)+4(−2)=−2
2x=8−2
2x=6
x=3
Oxidation state of SO
3
2−
x+3(−2)=−2
x=6−2
x=4
Oxidation state of S
2
O
6
2−
2(x)+6(−2)=−2
2x=12−2
2x=10
x=5
So the oxidation state of sulphur in the anions S
2
O
4
2−
, S
2
O
4
2−
and S
2
O
6
2−
follows the order.S
2
O
4
2−
<SO
3
2−
<S
2
O
6
2−
.hope it helps u
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