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rect Question 19 0/5 pt Which of the following are oxidation-reduction reactions? 1. PC13 + Cl2 PCIE II. Cu + 2AgNO3 - Cu(NO3
correct Question 20 0/5 pts Answer the following questions that refer to the unbalanced reaction shown below as it occurs in
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Answer #1

19)

I and II

In I , P is oxidised from +3 to +5

In II, Cu is oxidised from 0 to + 2 and Ag is reduced from + 1 to 0

20)

The balanced equation is

Cr2O72-(aq)   + 6I-(aq) + 14H+(aq) ------> 2Cr3+ (aq) + I2(s) + 7H2O(l)

Therefore,

Coefficient of i- is 6

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