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JEEMAIN and NEET
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Chemistry
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Some Basic concepts in Chemistry
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Q)
In nature,abundance of
1
H
1
and
2
H
1
are 99.985 and 0.015 percent respectively and water obtained from it contains
H
2
O
and
D
2
O
.The number of
D
2
O
molecules in 400mL water (if density is assumed to be 1.0g/mL) will be :
(
a
)
10
21
(
b
)
2
×
10
21
(
c
)
3
×
10
21
(
d
)
4
×
10
21
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