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Olympiad-Science
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Class 7
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Q)
Which gas evolves when charcoal is burnt?
A
.
O
z
o
n
e
B
.
O
x
y
g
e
n
C
.
C
a
r
b
o
n
D
i
o
x
i
d
e
D
.
N
i
t
r
o
g
e
n
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