1.

If the masses of Cr and O are in the ratio 13:12Cr_2O_3, then the ratio of O that cobines with the same mass of Cr in Cr_2O_3 and Cr_2O_7 is

Answer»

`1 : 2`
`1 : 4`
`3 : 7`
`2 : 5`

ANSWER :C


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