Chemistry MCQ Paper-1 Cambridge question. URGENT!
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Chemistry MCQ Paper-1 Cambridge question. URGENT!

[From: ] [author: ] [Date: 12-05-09] [Hit: ]
............
When chlorine and aqueous sodium hydroxide are heated together the following overall reaction
occurs.


3Cl 2(aq) + 6NaOH(aq) → 5NaCl(aq) + NaClO3(aq) + 3H2O(l)

What are the oxidation numbers for chlorine in each of the following species?

Cl2 --- NaCl --- NaClO3
0 ------ +1 ------ -5 --- (Option A)
+2 ---- –1 ----- +3 --- (Option B)
0 ------ –1 ----- +5 --- (Option C)
–2 ---- +1 ----- –3 --- (Option D)

Please tell me how you found the answer??

-
Option C .............
Since Cl2 is an uncombined element, oxidation number is 0
Oxidation number of Na is +1 so to balance it , it is -1 for Cl
For O3 it is -6 , for Na it is +1..........so it must be +5 for Cl to balance it out
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