important chemistry questions for class 12-
1. What is buffer? Write Henderson equation for calculating pH of an acidic buffer.
2. Define activation energy. What is Arrhenious equation?
3.The rate of chemical reaction decreases as the reaction proceeds. Explain.
4. An aqueous solution of sodium acetate is basic whereas that of sodium chloride is neutral. Explain.
5. What is galvanic cell? Give an example.
6.Boron halides are lewis acids. Explain.
7. State Lechatiler,s principle.
8.Define enthalpy of formation.
9. What is electrode potential? Write the expression for the emf of a cell in terms of oxidation potentials.
10. What is ionic product of water? Does its value change with temperature?
important chemistry questions for class 12
11.State Kohlrauch's law.
12. What is buffer solution?
13. Why sodium carbonate solution is alkaline?
14. What is the difference between order & molecularity of reaction?
15. State & explain Kohlrausch's law?
16. What is an electrolyte? Give its two example.
17.Define equivalent conductance.
18. Write two applications of electrolysis.
19. State Faraday's law of electrolysis?
20. Define molar conductance.
21. What is nuclear fission? explain with an example.
22. Why anhydrous ferric chloride cannot be prepared by heating hydrated ferric chloride?
23. What is packing fraction? How is related to stability of nuclei?
24. Explain why copper exhibits variable valency?
25. Whatis the function of lime stone in iron extraction?
26. How blue vitriol is prepared?
27. Why transition metal compounds are paramagnetic?
28. What is leaching? give an example.
29. Why alkali metals act as strong reducing agents?
30. Write the chemical formula for chile salt peter and brown ring produced during test for nitrate.
31. What is double salt? give an example.
32. What is Bleaching powder? Mention one method of preparation.
important chemistry questions for class 12
33. Why are most of the transition elements and their compounds paramagnetic?
34. Distinguish between an alloy & amalgam.
35. Why do transitional elements from complex compounds?
36. What happens when potassium iodide solution is added to an aqueous solution of copper sulphate. Give equation.
37. How green vitriol is prepared from Kipp's waste?
38. Why are transition metal compounds coloured?
39. Why chromium has a higher boiling point than zinc?
40. What is carbon dating?
41. What is group displacement law?
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