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 electro magnetic radiation is emitted by radioactive substance-
2. The hottest part of the gas flame is known as
4. German silver used for making utensils is an alloy of
5. Total number of halogen elements found in the periodic table is
7. The mass number of a nucleus is
8. What is 'milk of magnesia' chemically?
9. What is "milk of magnesia' chemically ?
10. The substance which does not expand on going from liquid state to solid state is