The colour discharge tubes for advertisement mainly contain [CPMT 1980

1.	The colour discharge tubes for advertisement mainly contain [CPMT 1980, 89; MP PET 2002]
A.	Argon
B.	Neon
C.	Helium
D.	Xenon
Answer» C. Helium

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The colour discharge tubes for advertisement mainly contain [CPMT 1980, 89; MP PET 2002]

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