1. Isotope C-14 is related to-
2. 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?
3. What happens to the weight of iron, when it rusts?
4. 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.
6. Which of the following liquids is a bad conductor of electricity?
7. Which one of the following acids is used in lead storage battery?
8. Physico-chemical characteristics of water in water sources undergo changes due to-
9. Litmus solution is a purple dye extracted from A. Hibiscus B. Lichen C. Lotus D. Lily The correct statement/s is/are.
10. The amount of the solute present per unit volume of per unit mass of the solution/solvent is known as______ in Chemistry.
11. A mixture of sand and naphthalene can be separated by
13. Catalyst is the element which-
14. The conversation of solid directly into gas:
15. The nucleus of an atom consists of
16. Change of water into vapour is called-
17. Isomers generally differ in:
18. The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is
20. Why does dry HCl gas not change the colour of dry litmus pater?
21. What does 'p' represent in pH?
22. Which of the following is an example of chemical change?
23. Which acid is described as HOOCCOOH ?
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. 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_____.
27. When rain water has pH below _______ it is called acid rain.
28. In a hypertonic solution, RBC (Red Blood Cell)
29. The atomic number of Tritium is _______.
30. Which of the following slows down the reaction rate?
31. Commonly available saline solution used for medical purposes is actually a mixture of water and _______.
32. Potassium permanganate is used for purifying drinking water, because
34. Isotopes of an element differ in:
35. Which of the following particles has zero charge?
36. Tooth decay occurs when pH of the mouth is__.
37. An example of physical change-
38. Which one is a fundamental particle?
39. Which of the following is not a subatomic particle?
40. Which one of the following pairs is correctly matched?
41. Which one of the following salts should not be used as dining table salt?
42. Pasteurization is related to :
43. NTU is the unit for measuring.
44. 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
45. Two statements are given below. One is Assertion (A) and second is Reason (R). Assertion (A) : A chemical reaction becomes faster at higher temperatures. Reason (R) : At higher temperatures, molecular motion becomes more rapid Code :
46. Pasteurization is a process by which-
48. When α-particle emits from a radioactive element then
49. The structure of d- orbital is:
50. Tomato is natural source of
