0
A) Hydrogen / हाइड्रोजन
B) Oxygen / ऑक्सीजन
C) Helium / हीलियम
D) Carbon dioxide / कार्बन डाइऑक्साइड
Correct Answer: C
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.