1. An aqueous solution X turns phenol- phthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.
2. In which of the following, the identity of initial substance remains unchanged ?
3. H2S04 can be prepared by reaction of water with-
4. The example of olfactory indicators is
5. The difference of molecules of water in gypsum and POP is
6. The function of quick lime in soda lime mixture is to
7. To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
8. The pH of the gastric juices released during digestion is
9. The pH of a solution of HCl is 4. This shows that the molarity of the solution is
10. A solution turns red litmus blue, its pH is likely to be
11. Tartaric acid is found in
12. Out of the following which one is a strong acid?
13. A solution showed pH 9. This solution is
14. The pH of distilled water is
15. The pH of an acid is
16. The solutions whose pH is more than 7 and less than 14 are
17. Acetic acid is found in
18. Lactic acid is found in
19. The pH of acid rain water is
20. Acids and bases react to produce
21. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) The temperature of the solution increases (ii) The temperature of the solution decreases. (iii) The temperature of the solution remains the same. (iv) Salt formation takes place.
22. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish- orange. Which of the following would change the colour of this ph paper to greenish-blue?
23. Calcium phosphate is present in tooth enamel. Its nature is
24. Which of the following salts does not contain water of crystallisation!
25. Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved (i) It turns lime water milky (ii) It extinguishes a burning splinter. (iii) It dissolves in a solution of sodium hydroxide. (iv) It has a pungent odour,
26. Which of the following phenomena oecur, when a small amount of acid is added to water? (i) lonisation (ii) Neutralisation (iii) Dilution (iv) Formation
27. Which one of the following can be used as an acid-base indicator by a visually impared student?
28. Which of the following substances will not give carbon dioxide on treatment with dilute acid?
29. Which of the following is acidic in nature!
30. Which of the following statements is correct about an aqueous solution of an acid and a base? (i) Higher the pH, stronger the acid (ii) Higher the pH, weaker the acid (iii) Lower the pH, stronger the base (iv) Lower the pH, weaker the base
31. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is
32. The indicators which turn red in acid solution are
33. The property which is common between vinegar and curd is that they (A) Have sweet taste (B) Have bitter taste (C) Are tasteless (D) Have sour taste
34. The indicator which produces a pink colour in an alkaline solution is
35. A solution reacts with zinc granules to give a gas which burns with a pop sound. The solution contains
36. Bee sting contains
45. The acid produced naturally in our stomach is
46. The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?
47. One of the following salts will give an alkaline solution on dissolving in water.
48. The salt which will give a neutral solution on dissolving in water will be
49. The products of chlor-alkali process are
50. The salt whose aqueous solution will turn blue litmus to red is