1. Corrosion of metals is a .................reaction

2. The most electronegative element in periodic table is

3. Chemistry is the branch of science that deals with

4. The matter exists in

5. Neil Bhor mainly concentrated upon

6. The Atoms can exist freely in nature

7. ..............is homogenous mixture of two or more substances

8. When a covalent bound is formed  by two electron pair termed as a

9. The electro planting prevents

10. Oxidation is the process of adding oxygen and removing

11. When a covalent bound is formed  by a single electron pair termed as a

12. Manometer is used for the determination of

13. In a group the elements have almost same

14. The KCI has the type of bonding

15. The air is  a

16. The different forms of element are called

17. The Atom is a Greek word

18. Steel is the alloy of

19. The sum of masses of all atoms in a molecule is called

20. Chemical reactions involve migration of