Helium gas is filled in ballons because
1). its atomic number is 2
2). it is lighter than air
3). it is one of the constituents of water
4). it is a noble gas
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1. Which of the following elements is obtained from seaweeds ?
3. German silver an alloy does not contain the metal
4. Which of the following is not a Halon gas ?
5. Which among the following is pure matter ?
6. Percentage of carbon in steel i ranges from
7. The mass number of a nucleus is.
9. Question 13.11:What are the necessary conditions for any system to be aromatic?