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1. The number of atoms present in 16 g of oxygen is, (1) 6.02 x10" (2) 3,01 x 10”, (3) 3.01 x10" 446.02 x 10”, , 2. — Thenumber of atoms in 4.25 g of NH, is approx:, (1) 1 x 10% (2) lox 102, (3) 2 108 \(4)-6 x 108, , 3. Which of the following contains maximum number, of oxygen atoms ?, (1)1gofO, (2) 1g of O,, (3) 1gof 0,, ~(@)all have the same number of atoms, , 4. The number of atoms present in 0.5 g atom of, 7 nitrogen is same as the atoms in —, (1) 12g 0fC (2) 32g of S, g of oxygen (4) 24 g of Mg, 5. Which of the following contains maximum number, of atoms ?, \) 4g of H, (2) 16 g of O,, (3) 28 g of N, (4) 18g of H,O, 6. Number of neutrons present in 1.7 g of ammonia, is (1) N, (2) N,/10 x4, \B) (N,/10) x7 (4) N, x10 x7, , 7. 5.6 Lof oxygen at STP contains (1) 6.02 x 103 atoms (2) 3.01 x 10% atoms, (3) 1.505 x10% atoms (4) 0.7525 x10® atoms, , 8. Number of oxygen atoms in 8 g of ozone is , , , , , , , , , , , , , , 6.02 10%, , (0) 6.02 x10" ee, , , , Sum of number of protons, electrons and NetUtreg,, in 12g of %C is:, J, , (1) 1.8 (2) 12.044 x19, (3)4.084 x10 (4) 10.84 x19%, , 11. The weight of one atom of Uranium is 233 amy, , Its actual weight is .... g., (1) 1.43 1076, (3) 6.99 x10”, , (25.94 x 10-2, (4) 1.53 x10, , 12. The actual weight of a molecule of water is (1) 18g, 2) Z59 x10, , (3) both (1) & (2) are correct, (4) 1.66 x10**g, , 13. What is the mass of a molecule of CH, :—, (1) 16g (2) 26.6 x 10% g, . (372.66 x 10g (4) 16N,g, , 14. Which of the following has the highest mass ?, (1) 1 g atom of C, (2) 1/2 mole of CH,, (3) 10 mL of water, (4) 3.011 x 10” atoms of oxygen, , 15. Which of the following contains the least number, of molecules ?, , (1) 4.4g CO,, , (2) 3.4g NH,, (3) 1.6 g CH,, , (4) 3.2 g SO,, , 16. The number of molecule in 4.25 g of NH, is(1) 1.505 x 10%, , , , , , , , (2) 3.01 x 1028, (3) 6.02 x 1023 (4) None of these, 17. Elements A and B form two compounds B,A, and :, B.A. 0.05 moles of B.A, weight 9.0 g and:, 0.10 mole of B,A weight 10 g. Calculate the ue, weight of A and B :(1) 20 and 30 (2) 30 and 40, (3)40 and 30 (4) 30 and 20, 18. 5.6L of oxygen at NTP is equivalent to —, (1) 1 mol (2) 1/2 mol, 59014 mol (4) 1/8 mol, 19. 4.4 of an unknown gas occupies 2.24 L of, at STP. The gas may be :(1) N,O (2)CO —, , (3) CO,

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} 20. Which contains least number of molecules :—, , ‘, , , , NI SOMEHASCCORCEPTS OF OEMSTINOZ EXE NS, , 21., , 22., , 23., , 24., , 25., , 26., , 27., , 29., , E, , 1 aC,, , (3)1g0,, , (2)1gN,, @)1gH,, , If V mL of the vapours of substance at NTP weight, W g. Then molecular weight of substance is:, MIWA) x 22400 (2) a x 22.4, Wx1, , 3) (W - WT, , YW) ¥ 22809 i 62) 90400, , If 3.01 x 10” molecules are removed from, , 98 mg of H,SO,, then the number of moles of, , H,SO, left are :—, , (1) 0.1 x 10° (2) 0.5 x 10%, , (3) 1.66 x 10% (4) 9.95 x 102, , A gas is found to have the formula (CO).. It's VD is, 70. The value of x must be:, (7 (2)4 <(3)5 (4)6, Vapour density of gas is 11.2. Volume occupied, by 2.4 g of this at STP will be , (1) 11.2L (2) 2.24 L, , (3) 22.4L (4) 2.4L, , The volume of a gas in discharge tube is, 1.12 x 10” mL at STP. Then the number of, molecule of gas in the tube is , (1) 3.01 x10* (2) 3.01 x 10%, (373.01 x10” (4) 3.01 x10, , A person adds 1.71 gram of sugar (C,,H,,O,,) in, order to sweeten his tea. The number of carbon, atoms added are (mol. mass of sugar = 342), (13.6 x 107 (2) 7.2 x 107, , (3) 0.05 (4) 6.6 x 10%, , The total number of ions persent in 1 mL of 0.1 M, barium nitrate Ba(NO.), solution is , (1) 6.02 x10" (2) 6.02 x10”, \(8)3.0 x6.02 x10" (4) 3.0 x6.02 x 107, , The weight of 1 mole of a gas of density, 0.1784 gL“ at NTP is , (1) 0.1784 g (2)1g, , , , 30., , Pre-Medical : Chemis, , The number of gram molecules of oxygen in, 6.02 x 10 CO molecules is —, , (1) 10 g molecules (2)5 g molecules, , (3) 1 g molecules (4) 0.5 g molecules, , , , 31., , 32., , 33., , 34., , 35., , 36., , 37., , 38., , 39., , \ BYR,, , A compound of X and Y has equal mass of them, If their atomic weights are 30 and 20 respectively, Molecular formula of the compound is =~, , (1) X,Y, (2) X,Y,, , (4)X%Y,, , An oxide of sulphur contains 50% of sulphur in it., Its emperial formula is (1) SO,, , (3) SO, , A hydrocarbon contains 80% of carbon, then the, hydrocarbon is , (2) SO,, (4) S,0, , (1) CH, (2) C,H,, (3) CH, (4) C,H,, Emperical formula of glucose is , (1) C,H,,0, (2) CHO,, (3) CHO, (4) CH,O, , An oxide of metal M has 40% by mass of oxygen., Metal M has atomic mass of 24. The emperical, formula of the oxide is :, ()M,O (2)M,O,, A compound contains 38.8% C, 16.0% H and, 45.2% N. The formula of the compound would be, (1) CH,NH, (2) CH,CN, , (3) CJH,CN (4) CH,(NH),, , The simplest formula of a compound containing, , 50% of element X(at wt. = 10) and 50% of element, Y(at wt. = 20) is:, (1) XY (2)X,Y, Which of the following compounds has same, empirical formula as that of glucose:, , (1) CH,CHO .(2)CH,COOH, , (3) CH,OH (4) C,H,, , A gas is found to contain 2.34 g of Nitrogen and, , 5.34 g of oxygen. Simplest formula of the, compound is , (3)MO_ (4)M,O,, , (XY, X,Y, , 84a (4)4.amu ()N,O (NO (3)N,0, 4) NO,, Given that one mole of N, at NTP occupies 40. 2.2. gofa compound of phosphorous and sulphur, 22.4 L the density of N, is - has 1.24 of 'P’ in it. Its emperial formula:is 1.25 gL3 (2)0.80 gL" (1) P,S, (2) PS,, F@\25a17 (4) 1.60 g L* (3) P,S, PSs ,, 22, ett, , pee |

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Pre-Mdical : Chemistry meni, was found to, , 41, On analysis, a certain compound, contain iodine and oxygen in the ratio of 254:80., The formula of the compound is :, (At mass I = 127, O = 16), (1) 10 (0 (3) 0, ~4IL0s, , 42. The number of atoms of Cr and O are 4.8 x 10”, pirical formula _—, , and 9.6 x10" respectively. Its em, (1) Cr,0, (2) CcrO,, (3) Cr,O, (4) CrO,, 43. Insulin contains 3.4% sulphur ; the minimum, molecular weight of insulin is :, () 941.176 (2) 944, (3) 945.27 (4) None, , 44. Agiant molecule contains 0. 25% of a metal whose, atomic weight is 59. Its molecule contains one atorn, of that metal. Its minimum molecular weight is , , , (1) 5900 (2) 23600, 100 x59, (3) 11800 (4) 04, , 45. Caffine has a molecular weight of 194. It contains, 28.9% by mass of nitrogen Number of atoms of, , nitrogen in one molecule of it is :(1) 2 (2) 3, (3)4 (4) 5

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114., , 115., , 116., , 117., , The law of multiple proportion was proposed by :, , (1) Lavoisier (2) Dalton, (3) Proust (4) Gaylussac, Which one of the following pairs of compound, , illustrate the law of multiple proportions ?, (1)F0; Na,O (2) MgO, Na,O, , (3) Na,O, BaO (4) SnCl,, SnCl,, , In the reaction N, + 3H, ———> 2 NH,, ratio by, volume of N,, H, and NH, is 1: 3 : 2. This illustrates, , law of , (1) Difinite proportion, , (2) Multiple proportion, , (3) Law of conservation of mass, , (4) Gaseous volumes, , Different proportions of oxygen in the various, oxides of nitrogen prove the law of , (1) Equivalent proportion, , 3 (2) Multiple proportion, , (3) Constant proportion, (4) Conservation of matter

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119. The law of conservation of mass holds good for aj), of the following except (1) All chemical reactions, (2) Nuclear reactions, (3) Endothermic reactions, (4) Exothermic reactions, , 120. Number of molecules in 100 mL of each of O,,, NH, and CO, at STP are (1) in the order CO, < O, < NH,, (2) in the order NH, < O, < CO,, , \(3) the same, (4) NH, = CO, <0,, , 121. The empirical formula of an organic compound, containing carbon and hydrogen is CH,,. The mass, of one litre of this organic gas is exactly equal to, that of one litre of N, at same temperature and, pressure. Therefore, the molecular formula of the, , organic gas is —, (C,H, (2) C,H,, (3) CHy, (4) C,H,, , 122. Four one litre flasks are seperately filled with the, gases hydrogen, helium, oxygen and ozone at same, , , , , , , , , room temperature and pressure. The ratio of total, , number of atoms of these gases present in the, , different flasks would be , (1:1:1:1 (2)1:2:2:3, @)2:1:2:3 )2:1:3:2, , 123. A container of volume V, contains 0.28 g of N,, gas. If same volume of an unknown gas under, ies similar condition of temperature and pressure, , : 0.44 g, the molecular mass of the gas is, , (4) 88, , a, , , , , , two identical vessels. A contains, at 1 atm K. The aoe E