The oxidation number of the underlined atom in the following species is wrongly matched

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HAuCl4 is + 3

Cu2O is –1

ClO3- is +5

K2Cr2O7 is +6

answer is B.

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Detailed Solution

(1) HAuCl4⇒(+1)+x+4(−1)=0 x=+3(2) Cu2O ⇒ 2(+1) + x = 0 x = –2(3) ClO3- ⇒ x + 3 (–2) = –1 x = +5(4) K2Cr2O7 ⇒ 2(+1) + 2x + 7(–2) = 0 x = +6

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