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
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