20. It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?
Troposphere
Stratosphere
Exosphere
Ionosphere
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let me tell u
the layer which has the most amount of heluim gas is the layer called exosphere
for more reference
refer to class 7 ncert text book
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the layer exposphere have more percent of helium gas
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