Q. Which of the following gases are created at the beginning of universe?
1. Hydrogen
2. Helium
3. Lithium
Select the correct answer using the codes given below: 
Answer: D
Notes:
The only chemical elements created at the beginning of our universe were hydrogen, helium and lithium, the three lightest atoms in the periodic table. These elements were formed throughout the universe as a hot gas.
Source: NCERT
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