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

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

3. Chemical reactions involve migration of

4. The electro planting prevents

5. In a group the elements have almost same

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

7. The Atoms can exist freely in nature

8. Oxidation is the process of adding oxygen and removing

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

10. Chemistry is the branch of science that deals with

11. Manometer is used for the determination of

12. The different forms of element are called

13. The KCI has the type of bonding

14. The most electronegative element in periodic table is

15. The matter exists in

16. Neil Bhor mainly concentrated upon

17. The air is  a

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

19. The Atom is a Greek word

20. Steel is the alloy of