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Q.

Which of the following statements is/are correct?In the reaction xCu3P+yCr2O72−⟶Cu2++H3PO4+Cr3+

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a

Cu in Cu3P is oxidised to Cu2+ whereas P in Cu3P is also oxidised to PO43−

b

Cu in Cu3P is oxidised to Cu2+ whereas P in Cu3P is reduced to H3PO4

c

In the conversion of Cu3P to Cu2+ and H3PO4, 11 electrons are involved

d

the value of x is 6

answer is A.

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Detailed Solution

4H2O+Cu3P+1x3-3⟶3Cu2++H3PO4+11e−+5H⊕×6 6e−+14H⊕+Cr2O72−⟶2Cr3++7H2O×11                                          6Cu3P+124H⊕+11Cr2O72−⟶18Cu2++6H3PO4+22Cr3++53H2OTotal number of electrons transferred = 66
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