2. The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is
3. pH value shows the numeric value of-
4. Which among the following is an incorrect option?
5. Hydrofluoric acid is not kept in glass bottles because it reacts with-
6. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue?
7. Litmus solution is a purple dye extracted from A. Hibiscus B. Lichen C. Lotus D. Lily The correct statement/s is/are.
8. A glass of (1) tap water, (2) distilled water and (3) sea water is cooled to its solidification. The order in which they will solidify first is
9. Catalyst is the element which-
10. Consider the below two statements : Statement I : Lyophilic sols are more stable than lyophobic sols Statement II : Lyophilic colloids are extensively solvated From the above statements, choose the correct answer from the options given below;
11. As per Government specifications, what is the desirable range of pH value for drinking water in India?
12. Goldsmith uses aqua regia, which is prepared by mixing-
13. Which one of the following salts should not be used as dining table salt?
14. Tooth decay occurs when pH of the mouth is__.
15. The amount of the solute present per unit volume of per unit mass of the solution/solvent is known as______ in Chemistry.
17. Atomic weight of heavy water is-
18. Which among the following solutions has pH value more than 7?
19. A sample of any of the following substance disappears after sometime when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called_____.
20. When rain water has pH below _______ it is called acid rain.
21. The pH value of water is_____.
22. Change of water into vapour is called-
23. Which of the following slows down the reaction rate?
24. Soda water obtained by passing carbon dioxide in water is
25. A solution turns red litmus to blue; pH value of solution is:-
27. Pasteurization is a process by which-
28. Which one of the statements is correct for Liion batteries?
29. Aqua Regia is a yellow-orange coloured liquid used by jewellers to clean and dissolve noble metals like gold and platinum. It is actually a mixture of nitric acid and -
30. Consider the following statements and select the correct answer from the codes given below. Assertion (A): It is normally seen that when objects made of iron are kept in open atmosphere, then they turn into brown powder which is called rust. Reason (R): Rust or brown powder is formed due to deposition of compound called Tannin.
31. The pH value of water is_______.
32. Which is not a Lewis acid?
33. What is the color of litmus solution when it is neither acidic nor basic ?
34. When α-particle emits from a radioactive element then
35. Which of the following is/are the example/ examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.
36. Which of the following is an example of chemical change?
37. Tomato is natural source of
39. Neutron was discovered by-
40. Which is the stronger acid than phenol due to the presence of three same electron with drawing groups (i) O-Toluic Acid (ii) Benzoic acid (iii) Salicylic Acid (iv) Picric Acid
41. A mixture of sand and naphthalene can be separated by
42. In an atom, the order of filling up of the orbitals is governed by_____.
43. Regarding the atom of a chemical element, the magnetic quantum number refers to:
44. Gold could be dissolved in-
45. The pH scale is proposed by:
46. Which compound is named as 'baking soda'?
47. The structure of d- orbital is:
48. Which of the following has pH value 7?
