Which of the following is a monoatomic gas?
1). Oxygen
2). Neon
3). Nitrogen
4). Fluorine
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1. Which one element has the lowest electronegativity value
3. The substance which does not expand on going from liquid state to solid state is
4. Which of the following vitamins contain nitrogen?
5. The transuranium elements are the chemical elements with atomic numbers greater than
6. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water.
7. Which of the following is not a nitrogenous fetiliser?
8. Earth's crust mainly contains ______.
9. Which one is not a primary greenhouse gases in the Earth's atmosphere?