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Olympiad-Science
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Class 7
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Q)
Which of the following gases is lighter than air ?
(
A
)
C
a
r
b
o
n
d
i
o
x
i
d
e
(
B
)
O
x
y
g
e
n
(
C
)
A
m
m
o
n
i
a
(
D
)
C
h
l
o
r
i
n
e
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