Redox Reactions - Result Question 6

####6. Oxidation numbers of P in PO43−, of S in SO42− and that of Cr in Cr2O72− are respectively

[2009]

(a) +3,+6 and +5

(b) +5,+3 and +6

(c) −3,+6 and +6

(d) +5,+6 and +6

Show Answer

Solution:

  1. (d) PO43−=x+4(−2)=−3;x−8=−3;x=+5

SO42−=x+4(−2)=−2;x−8=−2;x=+6

Cr2O72−=2x+7(−2)=−2;2x−14=−2;

2x=12;x=+6

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