1. Hydrogen is a good __________ agent.

2. Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

3. Radioactive elements emit α, β and γ rays and are characterised by their halflives. The radioactive isotope of hydrogen is

4. Polyphosphates are used as water softening agents because they

5. Para and ortho hydrogen differ in

6. The volume strength of 1.5 NH₂O₂ solution is :

7. Consider the reactions (A) H2O2 + 2HI → I2 + 2H2O (B) HOCl + H2O2 → H3O++ Cl–+ O2

Which of the following statements is correct about H2O2 with reference to  these reactions? Hydrogen peroxide is ________.

8. Which of the following pairs of substances on reaction will not evolve H₂(g)?

9. Water gas is mixture of hydrogen H₂ and

10. The volume of 10 volume H₂O₂ required to liberate 500 ml of O₂ at S.T.P. is :

11. Atomic hydrogen is called

12. What is gram equivalent weight of hydrogen peroxide as reductant?

13. Which of the following statements regarding hydrogen peroxide is/ are incorrect?

14. Action of water or dilute mineral acids on metals can give

15. The structure of H₂O is

16. Which of the following equations depict the oxidising nature of H2O2?

17. The freezing point of heavy water is

18. The reagent commonly used to determine hardness of water titrimetrically is

19. Hydrogen is most __________ element in the universe.

20. Which of the following hydrides are generally nonstochiometric in nature?