The ratio by mass of C and O in ${CO}_{2}$ is-

1:2

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3:14

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3:8

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3:11

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Solution

The correct option is C
3:8

Explanation for correct option (c):
Molecular mass of C = 12g
Molecular mass of O is = 16g
Molar mass of Carbon dioxide ${CO}_{2}$ = 12 + 32 = 44g
Therefore, the ratio by mass of C and O in ${CO}_{2}$ is 12:32 = 3:8
Hence option C is correct

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