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The oxidation number of the underlined a...

The oxidation number of the underlined atom in the following species. Identify the incorrect option.

A

`ClO_(3)^(-)` is +5

B

`K_(2)Cr_(2)O_(7)` is +6

C

`HAuCl_(4)` is +3

D

`Cu_(2)O` is -1

Text Solution

Verified by Experts

The correct Answer is:
D
(a) `ClO_(3)^(-)`
`x + 3(-2) =-1`
`x=+5`
(b) `K_(2)Cr_(2)O_(7)`
`2(+1) + 2x + 7(-2) =0`
`x = +6`
( c) `HAuCl_(4)`
`(+1) + x + 4(-1)=0`
`x = +3`
( d) `Cu_(2)O`
`2(+1) + x=0`
`x =-2`
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