AP 9th Physical Science Mock Test 2021 For Chapter 5 : “Atoms and Molecules” Online Practice Test

1. An element having only mono atomic molecules
2. Valency of both calcium and sulphate ions is 2 , then formula of calcium sulphate is
3. The 'Law of definite composition' was given by
4. Value of Avogadro's number is
5. The % by weight of calcium in calcium carbonate is
6. 1 amu =
7. An odd molecule among them
8. Choose the correct formula of a compound
9. In SO2 , the mass of sulphur that combines with 6g of oxygen is
10. Argon is
11. The structural formula of a compound is CH3COOH , its empirical formula is
12. The formula of copper carbonate is CuCO3, then formula of copper nitrate is
13. An ion is
14. Electron distribution in an atom is , K=2 , L=8 , M=1 then the element exhibits a valency
15. Electron distribution in an atom is , K=2 , L=8 , M=7 , in most of the reactions it exhibits a valency
16. The weight of oxygen combining with 20g of calcium , to give its oxide is
17. The mass of 6.022\times1022 molecule of oxygen is
18. Choose wrong statement
19. Calcium nitrate is a hetero-atomic molecule , the number of different atoms present in it are :
20. In water molecule , the mass ratio of hydrogen and oxygen is
21. The common name of the compound copper sulphate is
22. A given chemical substance always contains the same elements combined in a fixed proportion by mass . Guess the compounds formed in the ratio of 1 : 1 and 1 : 2 by carbon and oxygen
23. The cation in CaCl2 is
24. The symbol of element 'sodium' is
25. The formula of phosphoric acid
26. An example of Mono atomic ion
27. The chemical formula of Baking soda is
28. The formula of ozone is
29. The value of Avogadro number is
30. The combining capacity of an element is known as
31. The common name of hydrogen monoxide is
32. Valencies of nitrogen and hydrogen are 3 and 1 respectively, the formula of ammonia molecule formed by these two atoms
33. P : The atomicity of oxygen is 3
Q : The formula of ozone is O3
34. One of the precautions to be taken in the conduction of experiment on law of conservation of mass is
35. A diatomic element is
36. An example of cation is
37. These are buildings blocks of matter
38. The scientist who is popularly known as "Father of Modern Chemistry"
39. The chemical name of common salt is
40. The correct order in the activity to observe law of conservation of mass is
P. Take 100 ml of silver nitrate solution in a chemical flask and 5 ml of sodium                   chloride in a test tube
Q. Due to reaction between these two white precipitate will form
R. Add sodium chloride solution to silver nitrate solution
S. Weigh the two and record the sum of their weights
T. After reaction weigh it again and it will be equal to the previous reading
41. Uma : Mass is neither created nor destroyed during a chemical reaction
Rama : Matter is conserved in a chemical reaction
42. ? : Sodium carbonate :: Al2(SO4)3 : Aluminium sulphate
43. The combining capacity of atoms of an element with the atoms of other element is called its valency . Based on valency the odd one is
44. A neutral metal atom becomes di - positive ion by losing two electrons . In the same way a neutral non-metal atom becomes uni-negative ion by gaining one electron . The formula of a compound which is formed by these two ions is
45. We can test the law of conservation of mass by the reaction between barium chloride and sodium sulphate . While doing the experiment , one of the precautions you have taken is
46. Choose the correct match
  1. Potassium           ( ) a. Hg
  2. Silver                    ( ) b. K
  3. Sodium                ( ) c. Ag
  4. Mercury               ( ) d. Na
47. Based on atomicity match set-A with set -B

Set-A                                Set-B

P. Mono atomic             x. Fluorine
Q.Di atomic                    y.Helium
R.Tri atomic                   z.Ozone
48. The number 6.022\times1023
49. Some symbols of elements are based on their English names.Some other are based on their Latin names.Which of the following elements have symbols based on Latin names?
50. The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.If the atomic masses of hydrogen , ,sulphur and oxygen are 1 , 32 , 16 successively then the molecular mass of sulphuric acid is
51. Wrongly labelled part in below diagram is
52. Lavoisier popularly known as
53. Which of the following not a diatomic element ?
54. The following is not a cation
55. Na2CO3 : ? :: Al2(SO4)3 : Aluminium sulphate
56. For NH3 , the valencies of nitrogen and hydrogen
57. The chemical formula for water is
58. NaHCO3 is a chemical formuala for
59. Cl is
60. H3PO4 is formula for
61. The anion in CaCl2 is
62. Which of the following is wrong statement about an ion ?
63. The formula for copper carbonate is
64. The structural formula for C2H4O2
65. Molecular mass of calcium carbonate is
66. Convert the 36 g of water into moles
67. Symbol of Mole is
68. Mass of 1 mole of nitrogen atoms
69. 10 moles of sodium sulphite has the mass
70. Atomic mass of aluminium
71. Molecular mass of sulphuric acid
72. Which of the following statements are wrong about Dalton's Atomic theory ?
  1. Matter is made up of visible particles
  2. Atoms are either created nor destroyed by chemical reaction
  3. All atoms of an element are different in chemical and physical properties
73. A group of atoms carrying charge is a
74. The poly atomic ions
75. Make correct choice
  1. Magnesium chloride            ( ) a. Cu(NO3)2
  2. Calcium oxide                       ( ) b. MgCl2
  3. Copper nitrate                      ( ) c. CaO
76. The combining capacity of an element is known as
77. What is law of conservation of mass ?
78. S + O2---->
79. Magnesium + oxygen ---->
80. Where did chemical reaction takes place ?
81. Choose correct symbol
  1. Aluminium    ( ) a. Cl
  2. Chlorine         ( ) b. Cr
  3. Chromium     ( ) c. Al
  4. Beryllium       ( ) d. C
  5. Carbon            ( ) e. Be
82. Convert 12 g of oxygen gas into mole
83. Calculate the number of particles in 46 g of Na
84. O2 differs from O why ?
85. A: O2 differs from O
B: H2 differs from H
86. Atomic mass of S is
87. 55 is atomic mass for
88. Jyo: Manganese atomic mass is less than Ferrum
Honey: Manganese atomic mass is 55
89. The valency for Cl is
90. 4 is valency for
91. 2 is valency for
92. Latin name for gold is
93. Plumbum is Latin name for
94. The elements of monovalent has charge as
95. In aluminium cation is
96. Charge for divalent ions
97. Tetravalent has ........... units of charge
98. Atomic mass of silicon
99. Potassium Dichromate formula is
100. The mass of 1 mole of a substance which expressed in grams is called


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