1. A single type of atom is found in-
2. Catalyst is the element which-
3. 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;
4. Process of change of solid camphor into camphor vapour is called–
5. A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is
6. Tooth decay occurs when pH of the mouth is__.
7. 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.
8. As per Government specifications, what is the desirable range of pH value for drinking water in India?
9. Why does dry HCl gas not change the colour of dry litmus pater?
10. Gold could be dissolved in-
11. 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?
13. Isotope C-14 is related to-
14. 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_____.
15. Goldsmith uses aqua regia, which is prepared by mixing-
16. The structure of d- orbital is:
17. An atomic number of Tritium is _______.
19. Which among the following is an incorrect option?
20. Physico-chemical characteristics of water in water sources undergo changes due to-
22. Hydrofluoric acid is not kept in glass bottles because it reacts with-
23. Pasteurization is related to :
24. When α-particle emits from a radioactive element then
25. 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 -
26. Regarding the atom of a chemical element, the magnetic quantum number refers to:
28. Which one of the following is a fundamental substance?
29. Which of the following acid does not contain oxygen?
30. A solution turns red litmus to blue; pH value of solution is:-
31. The breath test conducted by police to check drunken driver has which one of the following on the filter paper?
32. In a hypertonic solution, RBC (Red Blood Cell)
33. An example of physical change-
34. Table salt (NaCl) is a product of-
35. Tomato is natural source of
36. Which is used to prevent rusting in iron?
37. 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
38. A man posing as goldsmith went to a house and informed the lady of the house that he will polish her gold ornaments for a nominal amount. He dipped the ornaments given by her in a solution called royal water and they sparkled like new. After he left, the lady weighed the ornaments and found that they reduced in weight. What could be the solution?
39. Potassium permanganate is used for purifying drinking water, because
40. Which of the following is not a subatomic particle?
41. Neutron was discovered by-
42. Which one of the statements is correct for Liion batteries?
43. 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.
44. Due to rusting, the weight of iron
45. Who discovered atomic nucleus?
47. Which one of the following pairs constitutes particle antiparticle pair?
48. Which of the following has pH value 7?
50. What is the color of litmus solution when it is neither acidic nor basic ?
