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Question
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?
Options:
A .  Stratosphere
B .  Troposphere
C .  Ionosphere
D .  Exosphere
Answer: Option D
Answer: (d)
The structure of the Exosphere says, the height of the volume sphere is above 500 km, having maximum hydrogen and helium and the researches are being done for its specific situation of the sphere.
Since the structure of the Atmosphere is divided into 6 spheres say–
Troposphere (up to 11 km),
Tropopause,
Stratosphere,
Ozonosphere,
Ionosphere and
Exosphere (above 500 km).

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