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

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

4. Hydrogen is most __________ element in the universe.

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

6. Atomic hydrogen is called

7. The structure of H₂O is

8. Para and ortho hydrogen differ in

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

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

11. Water gas is mixture of hydrogen H₂ and

12. The freezing point of heavy water is

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

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

15. Hydrogen is a good __________ agent.

16. 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 ________.

17. Polyphosphates are used as water softening agents because they

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

19. The volume strength of 1.5 NH₂O₂ solution is :

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