Page 1 :
Which of the following has the smallest mass ?, , (A) 4g of He (B) 6.023 x 10” atoms of He, , (C) 1 atom of He (D) 1 mole atoms of He, , The number of carbon atoms in 1 g of CaCO, is , (A) 6.023 « 10” (B) 6.023 x 10” (C) 3.0125 x 10 (D) 1.204 x 10”, 6.023 « 10” atoms of silver (Atomic mass = 108 u) weight , (A) 108 x 10°g {B) 108g (C) 0.108 g (D) 108g, Which of the following has largest number of molecules ?, , (A) 8g of CH, (B) 4.4. g of CO,, , (C) 34.2 g of CiH20,, (D) 2g ofH,, , Which of the following contains one mole molecules of the substance ?, (A) 16 g Oxygen (B)7 g Nitrogen (C) 2g Hydrogen (D) 36 g Water., , The number of molecules in 16.0 g of oxygen is (A) 6.02 « 107 (B) 6.02 x 10” (C) 3.01 « 10" (D) 3.01 x 10”, , The volume of one mole of a gas at normal temperature and pressure is (A) 11.2 litres (B) 22.4 litres (C) 100 litres (D) None of these, , The number of gram atoms in 8 g of he are , (A) 2 {B) 1.204 x 10 (C) 3.1 « 10” (D) None of these, The percentage of hydrogen in HO is (A) 8.88 (B) 11.12 (C) 20.60 (D) 80.0, , The charge in coulombs of 1 gram ion of N° is (the charge on an electron is 1.602 x 10" C) (A) 2.894 « 10°C (B) 3.894 « 10°C (C) 2.894 x 10°C (D) None of these

Page 2 :
11.Which of the following correctly represents 360g of water?, () 2 moles of water, , (ii) 20 moles of water, , (ili) 6.022 x 1023 molecules of water, , (iv) 1.2044 x 1025 molecules of water, , (a) ), , (b) (i) and (iv), (c) (ii) and (ili), (d) (ii) and (iv), , 12.Which of the following statements is not true about an atom?, , (a) Atoms are not able to exist independently., , (b) Atoms are the basic units from which molecules and ions are, , formed., , (c) Atoms are always neutral in nature., , (d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch., , 13.1 wor 1 amu means, , (a) 1/12th mass of C-12 atoms, (b) Mass of C-12 atom, , (c) Mass of 0-16 atom, , (d) Mass of Hydrogen molecule, , 14. Which of the following contains maximum number of molecules?, (a) 19 CO2, , (b) 1g N2, , (c) 1gH2, , (d) 1g CH4, , 15.4 sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of, Hydrogen by mass. This data supports, , (a) Law of Conservation of Mass, , (b) Las of Multiple Proportions, , (c) Law of Definite Proportions, , (d) Avogadro's Law, , 16.An element X is divalent and another element Y is tetravalent. The compound formed by, these two elements will be:, , (a) XY, , (b) X¥2, , (c) X2Y, , (d) X¥4

Page 3 :
17.The molecular formula of potassium nitrate is, (a) KNO3, , (b) KNO., , (c) KNO2, , (d) KON, , 18.3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms, in the solution are:, , (a) 6.68 x1023, , (b) 6.09 *1022, , (c) 6.022 «1023, , (d) 6.022 *1021, , 19.Molecular mass is defined as the:, , (a) Mass of one molecule of any substance compared with the mass of one atom of C = 12, (b) Mass of one atom compared with the mass of one atom of hydrogen, , (c) Mass of one atom compared with the mass of one molecule, , (d) None of the above, , 20.A change in the physical state can be brought about, , (a) only when energy is given to the system, , (b) only when energy is taken out from the system, , (c) When energy is either given to, or taken out from the system, (d) Without any energy change, , 21, The atomic mass of sodium is 23. The number of moles in 46g of sodium is ‘, (a)4, (b)2, (c) 0, (d)%, , 22.Laws which explain the formation of many oxides by nitrogen is, (a) Law of conservation of mass, , (b) Law of multiple proportions, , (c) Law of definite proportions, , (d) Avogadro's law, , 23.Which of the following is not equal in mass to the 116th part of an oxygen atom?, (a) 14th of helium atom, , (b) 112th of carbon atom, , (c) 128th of nitrogen atom, , (d) None of these

Page 4 :
24.Name the salts which contain the same number of ions per molecule as magnesium nitride., (i) Aluminium phosphate, , (ii) Potassium sulphite, , (ili) Barium phosphate, , (iv) Ferric chromate, , (a) i, iii, iv, , (b) ii, iv, , (c) i, ili, , (d) lil, iv, , 25.What would be the gram molecular mass of solid sulphur?, (a) 256 g, , (b) 128g, , (c) 64g, , (d) 32g, , 26,According to the law of definite proportions, ‘, , (a) matter remains constant, , (b) matter can neither be created nor destrayed matter remains constant, , (c) a chemical compound is aways made up of the same element combined together in the, same fixed proportion matter remains constant, , (d) All of these, , 27.When alpha-particles are sent through a thin metal foil, most of them go straight through the, foil because, ;, , (a) alpha-particles are much smaller than electrons., , (b) alpha-particles are positively charged, , (c) most part of the atom is empty space, , (d) alpha-particles move with a low velocity, , , , 28.A metal can form two Sulphides. In one Sulphide, the metal and Sulphur atoms are in the, ratio of 2:1. In the other, the metal and Sulphur atoms are in the ratio 2:3. The metal which, complies with the above compounds is., , (a) Gold, , (b) Copper, , (c) Iron, , (d) Lead, , 29.Which among the following is not a postulate of Dalton’s atomic theory, a. Atoms can not be created or destroyed, b. Atoms of different elements have different sizes, masses and chemical properties, C. Atoms of same elements can combine in only one ratio to produce more than any one, compound, d. Atoms are very tiny particles which can not be further divided

Page 5 :
30.Which of the following is a wrong Combination?, , a, 6,022 « 1023 molecules of oxygen = 32g of oxygen, b. 6.022 *10*23 ions of sodium = 23g of sodium, , Cc. 6.022 x10*23atoms of C = 24g of carbon, , d. 6.022 x 10°23 atoms of H = 1g of hydrogen atoms