1. When a neutral atom undergoes oxidation, the atoms oxidation state

2. A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?

3. When sodium carbonate solution is titrated against HCl solution, the indicator used is

4. Solubility of M₂S salt is 3.5 × 10^-6 then find out solubility product.

5. A  weak acid HX has the dissociation constant 1 × 10^-5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is

6. Which of the following aqueous solution will be the best conductor of electricity?

7. Which of the following mixtures in an aqueous solution of equimolar concentration acts as a buffer solution?

8. A base according to Bronsted concept is a substance which can

9. A certain buffer solution contains equal concentration of X^– and HX. The k_a for HX is 10^-8. The pH of the buffer is

10. Among the following the weakest Bronsted base is

11. When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the hydroxide ion concentration is

12. Which of the following aqueous solutions will have highest pH?

13. In 0.10 M aqueous solution of pyridine (C₅H₅N), find the percentage of pyridine that forms pyridinium ion (C₅H₅N⁺H) (K_b for C₅H₅N = 1.7 x 10^-9 )

14. Aluminium chloride is

15. On increasing the concentration of reactants in a reversible reaction, then equilibrium constant will

16. In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will

17. Highest pH will be recorded for which of the following solutions if they are equimolar

18. Find the conjugate acid of NH₂^–

19. What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)₂?

20. Find the pH of a solution when 0.01 M HCl and 0.1 M NaOH are mixed in equal volumes