31. The pH values of the three solutions X, Y, and Z are 2, 11 and 7 respectively. Arrange them in descending order of hydrogen ion concentration.
32. The pH of fresh ground water slightly decreases upon exposure to air because
33. When an acid reacts with a metal oxide, . . . . . . . . and . . . . . . . . as a product?
34. To dilute a concentrated acid, what should we do?
35. If the pH of a solution increases from 7 to 14, it indicates an increase in . . . . . . . . Ion concentration in the solution?
36. If the pH value of river water is . . . . . . . ., then its water is considered polluted with acidic waste.
37. NaCl is a salt, which is formed by-
38. If the pH value of a salt is 12, then it is a salt of . . . . . . . .
39. Which one of the following acids is used in battery?
40. Consider the following statements.
1. Limestone, chalk and marble are different forms of calcium carbonate.
2. When pH of rain water is less than 5.6, it is called acid rain.
3. Human body works with in the pH range of 7.0 to 7.8.
Which of the statements given above are correct?
1. Limestone, chalk and marble are different forms of calcium carbonate.
2. When pH of rain water is less than 5.6, it is called acid rain.
3. Human body works with in the pH range of 7.0 to 7.8.
Which of the statements given above are correct?
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