1. Which of the following particles has zero charge?
2. Which of the following liquids is a bad conductor of electricity?
3. A single type of atom is found in-
4. When rain water has pH below _______ it is called acid rain.
5. A solution turns red litmus to blue; pH value of solution is:-
6. When α-particle emits from a radioactive element then
7. The nucleus of an atom consists of
8. 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.
10. Which among the following is an incorrect option?
11. The mass number of a nucleus is:
12. pH value of a basic solution is always-
13. Pasteurization is related to :
14. Tomato is natural source of
15. Which particle is free of charge?
16. Regarding the atom of a chemical element, the magnetic quantum number refers to:
19. Due to rusting, the weight of iron
20. Which of the following acid does not contain oxygen?
21. Which one of the statements is correct for Liion batteries?
23. Isotope C-14 is related to-
24. Tooth decay occurs when pH of the mouth is__.
25. Isomers generally differ in:
26. Litmus solution is a purple dye extracted from A. Hibiscus B. Lichen C. Lotus D. Lily The correct statement/s is/are.
27. Arrange the following carbon compounds in the decreasing order of their melting points :
28. An iron frying pan can be effectively prevented from rusting by ____.
29. A mixture of sand and naphthalene can be separated by
30. An example of physical change-
31. 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_____.
32. What is the color of litmus solution when it is neither acidic nor basic ?
33. The structure of d- orbital is:
34. Which compound is named as 'baking soda'?
35. An atomic number of Tritium is _______.
36. Which of the following is an example of chemical change?
37. The pH value of water is_______.
38. Commonly available saline solution used for medical purposes is actually a mixture of water and _______.
39. The pH value of water is_____.
40. Which is used to prevent rusting in iron?
41. The conversation of solid directly into gas:
42. Which one of the following is a fundamental substance?
43. In a hypertonic solution, RBC (Red Blood Cell)
44. Catalyst is the element which-
45. Neutron was discovered by-
46. In an atom, the order of filling up of the orbitals is governed by_____.
48. As per Government specifications, what is the desirable range of pH value for drinking water in India?
49. 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?
50. The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is
