The mass ratio of carbon to hydrogen in methane is:

1 : 3

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1 : 4

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4 : 1

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3 : 1

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Solution

The correct option is D 3 : 1
The chemical formula of methane is $C H_{4}$ .

Atomic mass of carbon = 12 u
Atomic mass of hydrogen = 1 u

Therefore, the mass ratio of carbon to hydrogen in methane
= (Mass of 1 C atom) : (Mass of 4 H atoms)
= 12 : 4
= 3 : 1

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