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Which of the following contains greatest...

Which of the following contains greatest number of oxygen atoms ? .
(a). 1g of O
(b). `1g of O_(2)`
(c). g of `O_(3)`
(d). all have the same number of atoms

A

1 g of O

B

1 g of `O_(2)`

C

1 g of `O_(3)`

D

all have the same number of atoms

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The correct Answer is:
D
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