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The number of atoms of Cr and O in a compound are 4.8 x 10^10 and 9.6 x 10^10 respectively.

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The number of atoms of Cr and O in a compound are 4.8 x 1010 and 9.6 x 1010 respectively. Its empirical formula is

(a) Cr2O3

(b) CrO2

(c) Cr2O4

(d) none

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Correct option is (b) CrO2

The ratio of Cr and O atoms 4.8 x 1010 : 9.6 × 1010 = 1 : 2

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