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1. The existence of isotopes was discovered by
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
2. The positively charged particles of atoms are
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
3. An alloy is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
4. Electrons are present in the
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
5. Nucleus contains
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
6. Isotonic solutions have the same
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
7. The radioactive noble gas is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
8. In which of the following silver is not to be present?
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
9. The hardest non metal is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
10. The chemical reaction in which one element replaces the other element is called
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
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