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1. In compound A, 1.00g of nitrogen unites with 0.57g of, , oxygen. In compound B, 2.00g of nitrogen combines, with 2.248 of oxygen. In compound C, 3.00g of nitrogen, combines with 5.11g of oxygen. These results obey the, following law, , (a) law of constant proportion, , (b) law of multiple proportion, , (c) lawofreciprocal proportion, , (d) Dalton’s law of partial pressure, , 10?! molecules are removed from 200 mg of CO,. Themoles, of CO, left are:, , fa) 288~ 10% (b) 288« 10%, (c) 288* 10% (d) 288~ 10°, What volume of hydrogen gas, at 273 K and I atm. pressure, will be consumed in obtaining 21.6 g of elemental boron, (atomic mass = 10.8) from the reduction of boron trichloride, , by hydrogen ?, , (a) 6721 (b) 448L, , (c) 224L (@) 896L, , Number of g of oxygen in 32.2 g Na,SO,.10 H,Ois, fa) 208 (b) 224, , () 224 (4) 208

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6.02 « 107° molecules of urea are present in 100 ml of its, solution. The concentration of urea solution is, , (a) 002M (b) 001M, , (c) 0.001M (d) 01M, , (Avogadro constant, N, = 6.02 « 107° mol), , If we consider that 1/6, in place of 1/12, mass of carbon atom, is taken to be the relative atomic mass unit, the mass of one, , mole of the substance will, , (a) bea function of the molecular mass of the substance, (b) remain unchanged, , (c) increase two fold, , (d) decrease twice, , The weight of NaC! decomposed by 4.92 of H,SO,, if6 g of, sodium hydrogen sulphate and 1.825 g of HCl, were, produced in the reaction is:, , (a) 6921g (b) 4652, , (c) 2925g (d@) 14g, , Which one of the following is the lightest?, , (a) 0.2 mole of hydrogen gas, , (b) 6.023 « 1072 molecules of nitrogen, , (c) 0.1 g of silver, , (d) 0.1 mole of oxygen gas, , How many moles of magnesium phosphate, Mg ,(PO,), will, , contain 0.25 mole of oxygen atoms?, (a) 125~107 (b) 25107, (c) 0.02 (d) 3.125* 107, , The density (in g mL~') ofa 3.60 M sulphuric acid solution, that is 29% H,SO, (molar mass = 98 g mol!) by mass will be

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13., , 14., , (a) L45 (b) 1.64, (c) 188 (d) 12, A gas occupies a volume of 300 cc at 27°C and 620 mm, , pressure. The volume of gas at 47°C and 640 mm pressure, is:, , {a) 260cc (b) 310cc, , {c) 390cc (d) 450cc, , Haemoglobin contains 0.33% of iron by weight. The, molecular weight of haemoglobin is approximately 67200., The number of iron atoms (at. wt. of Fe = 56) present in one, molecule of haemoglobin is, , (a) 6 ({b) 1, , {c) 2 (d) 4, , The volume of 20 volume HO, required to get 5 litres of O,, at STP is, , (a) 250ml {b) 125ml, {c) 100ml (d) 50mi., In the reaction,, , 2AK(s) + 6HCI(aq) > 2ABP* (ag) +6CI (aq) +3H>(g), , (a) 112LH,(g)at STP is produced for every mole HC(aq), consumed, , (b) 6 LHC\(aq) is consumed for every 3 L H,(g) produced, , (c) 33.6L H,(g) is produced regardless of temperature and, pressure for every mole Al that reacts, , (d) 67.2 H,(g) at STP is produced for every mole Al that, reacts.

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15., , 16., , 17., , 18., , 19., , 20., , The concentrated sulphuric acid that is peddled commercial, is 95% H,SO, by weight. If the density of this commercial, acid is 1.834 g cm-, the molarity of this solution is, , (a) 178M (b) 120M, , (c) 105M (d) 157M, , What is the mass of precipitate formed when 50 mL of 16.9%, solution of AgNO, is mixed with SO mL of 5.8% NaC! solution ?, (Ag= 107.8, N= 14, O= 16, Na=23, Cl =35.5), , (a) 282 (b) 352, (c) 7g (d) 142, Number of valence electrons in 4.2 gram of N,~ ion is, (a) 4.2N, (b) ON,, (c) 16N, {d) 3.2N,, , A transition metal M forms a volatile chloride which has a, vapour density of 94.8. If it contains 74.75% of chlorine the, , formula of the metal chloride will be, (a) MCI, (b) Aci,, () MCI, (d) MCI,, , A gaseous hydrocarbon gives upon combustion 0.72 g of, water and 3.08 g. of CO,. The empirical formula of the, hydrocarbon is :, , (a) C,H, (b) C,H,, , (ce) CeHs (d) CyHg, , Following is the composition of a washing soda sample :, ance t. percent, , Na,CO, 106.0 S48, , NaHCO, 84.0 84, NaCl 585 68

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21., , On complete reaction with excess HCI, one kilogram of the, washing soda will evolve:, , {a) 9mol of CO, (b) 16mol of CO,, , (c) 17 mol of CO, {d) 18molofCO,, , Arrange the numbers in increasing no. of significant figures., 0.002600, 2.6000, 2.6,0.260, , {a) 2.6<0.260<0.002600 < 2.6000, , (b) 2.6000 <2.6< 0.002600 <0.260, , (c) 0260<2.6< 0.002600 <2.6000, , (d) 0.002600 < 0.260 < 2.6< 2.6000, , Dissolving 120 g of a compound (mol. wt. 60) in 1000 g of, water gave a solution of density 1.12 g/mL. The molarity of, the solution is:, , {a) 100M (b) 2.00M, , {c) 250M (d) 4.00M, , A gaseous compound of nitrogen and hydrogen contains, , 12.5% (by mass) of hydrogen. The density of the compound, relative to hydrogen is 16. The molecular formula of the, , compound is:, , (a) NH, (b) N,H, , (c) NH, (d) NH,, , The amount of BaSO, formed upon mixing 100 mL of 20.8%, BaCl, solution with 50 mL of 9.8% H,SO, solution with, 50 mL of 9.8% H,SO, solution will be:, , (Ba= 137,C1=35.5, $=32,H=1 andO= 16), , (a) 233g (b) 11.65g, , {c) 30.68 ({d) 332g