The evidence of existence of which of these noble gases was first observed in India during a solar eclipse?

The evidence of existence of which of these noble gases was first observed in India during a solar eclipse

Ques : The evidence of existence of which of these noble gases was first observed in India during a solar eclipse?

A. Helium

B. Krypton

C. Xenon

D. Argon

Ans : A. Helium

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