Nucleus of an atom consists of
1). Proton
2). Neutron
3). Proton and Neutron
4). Electron Proton and Neutron
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1. Helium gas is filled in balloons because
2. The common name of sodium tetraborate decahydrate is _____.
3. The substance which does not expand on going from liquid state to solid state is
4. Brass is a
6. The blue colour of water in the sea is due to-
7. 'Bhopal gas tragedy' 1984 is related to which gas
8. Among the following, which is always found in free-state in nature?