Question

oxidation state

Answer 1

what is the oxidation state of Cr?

Answer 2

can you explain how to get the answer

Answer 3

@.Sam.

Answer 4

4 atoms of oxygen and one atom of Cr. The charge is 2-
So if u arrange this into an equation
x+ 4 x -2= 0
therefor x + -8= o
x= 8

Answer 5

the answer is supposed to be Cr is 6+

Answer 6

i just dont understand why

Answer 7

yaa it oxidation state is +6

Answer 8

Oh i got it
The overall charge is -2 of the compound
and seperate -2 for oxygen atom
So the overall equation will be
X x 4-2= -2
x= -2+8
x= +6

Answer 9

Cr + 4(-2) =-2
Cr-8=-2
Cr=-2+8 =+6

Answer 10

but i thought neutral compounds are supposed to equal 0? no?

Answer 11

@chmvijay

Answer 12

yaaa but its not neutral here

Answer 13

yaa u have to consider than =0 for neutral molecules :) ur right

Answer 14

is it because its a transition metal and non metal?

Answer 15

is not neutral?@chmvijay

Answer 16

see CrO4-2 is not neutral
but N2aCrO4 is neutral
then you can claulate like this
2(+1) +Cr +4(-2) =0
2+Cr+-8 =0
Cr=+8-2 =6

Answer 17

it is nothing to do with ur transition metal and non metal

Answer 18

hey did u get it or noo :)any problem still scratching your head :)

Answer 19

so is there an easier way to identify when it is neutral or not@chmvijay?

Answer 20

yaaa neutral mean the over all compound should not bear any charge like Na2CrO4 here in this compound no charge over all can u make it out now
where as CrO4-2 as it is bearing total -2 charge

Answer 21

got it thank u!

Answer 22

you are welcome :)