21. A solution, which tends to resist changes in pH is called a __________ solution.
22. A mixture of acetic acid and sodium acetate acts as a __________.
23. According to Sorenson __________ is defined as negative logarithm of the hydrogen ion concentration.
24. pH is mathematically expressed as __________.
25. The pH of a neutral solution is __________.
26. __________ substances have pH values lower than 7.
27. __________ solutions have pH values more than 7.
28. Oxidation is __________ of electron.
29. Reduction is the __________ of electron.
30. Such chemical reactions in which the oxidation number of atoms or ions is changed are called __________ reactions.
31. Oxidation number of a free element is __________.
32. Oxidation number of Oxygen in a compound is __________.
33. The sum of oxidation number of any formula of a compound is __________.
34. The oxidation number of any ion is equal to the __________ on the ion.
35. __________ is the reaction in which an acid reacts with a base to form salt and water.
36. __________ are organic compounds which change colour in accordance with the pH of the medium.
37. An indicator that changes from colourless to pink in the presence of an alkaline solution is called __________.
38. An indicator that changes from red to yellow in the presence of an alkaline solution is called __________.
39. Dissociation constant is denoted by __________.
40. According to Bronsted-Lowry Concept, __________ is the donor of proton and __________ is the acceptor of proton.
22. A mixture of acetic acid and sodium acetate acts as a __________.
23. According to Sorenson __________ is defined as negative logarithm of the hydrogen ion concentration.
24. pH is mathematically expressed as __________.
25. The pH of a neutral solution is __________.
26. __________ substances have pH values lower than 7.
27. __________ solutions have pH values more than 7.
28. Oxidation is __________ of electron.
29. Reduction is the __________ of electron.
30. Such chemical reactions in which the oxidation number of atoms or ions is changed are called __________ reactions.
31. Oxidation number of a free element is __________.
32. Oxidation number of Oxygen in a compound is __________.
33. The sum of oxidation number of any formula of a compound is __________.
34. The oxidation number of any ion is equal to the __________ on the ion.
35. __________ is the reaction in which an acid reacts with a base to form salt and water.
36. __________ are organic compounds which change colour in accordance with the pH of the medium.
37. An indicator that changes from colourless to pink in the presence of an alkaline solution is called __________.
38. An indicator that changes from red to yellow in the presence of an alkaline solution is called __________.
39. Dissociation constant is denoted by __________.
40. According to Bronsted-Lowry Concept, __________ is the donor of proton and __________ is the acceptor of proton.
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