1. Chemistry is the branch of science that deals with

2. The air is  a

3. Neil Bhor mainly concentrated upon

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

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

6. The electro planting prevents

7. The matter exists in

8. The different forms of element are called

9. Manometer is used for the determination of

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

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

12. The most electronegative element in periodic table is

13. Chemical reactions involve migration of

14. The Atom is a Greek word

15. Corrosion of metals is a .................reaction

16. Oxidation is the process of adding oxygen and removing

17. The Atoms can exist freely in nature

18. Steel is the alloy of

19. The KCI has the type of bonding

20. In a group the elements have almost same