Some Basic Concepts of Chemistry PYQs Set 2 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 2 (Q31-60)
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31. $The density (in g m L^{-1}) of a 3.60 M sulphuric acid solution that is 29% (H_{2} S O_{4} molar mass = 98 g m o l^{-1}) by mass will be:$ (1) $1.22$ (2) $1.45$ (3) $1.64$ (4) $1.88$ 32. $The number of grams of oxygen in 32.2 g of Na_{2} SO_{4} \cdot 10 H_{2} O is approximately$ (1) $32.2 g$ (2) $22.4 g$ (3) $11.2 g$ (4) $64.4 g$ 33. $At what temperature, the Celsius and Fahrenheit readings have the same numerical value?$ (1) $- 35^{\circ}$ (2) $- 40^{\circ}$ (3) $- 45^{\circ}$ (4) $- 30^{\circ}$ 34. $In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm^{3} at 273 K ?$ (1) $0.0355 g$ (2) $0.071 g$ (3) $6.023 \times 10^{21} molecules$ (4) $0.02 mole$ 35. $Consider the reaction 4 H N O_{3} (l) + 3KCl(s) \to C l_{2} (g) + NOCl(g) + 2 H_{2} O(g) + 3 K N O_{3} (s) The amount of H N O_{3} required to produce 110.0 g or K N O_{3} is : (Given : Atomic masses of H, O, N and K are 1, 16, 14 and 39, respectively.)$ (1) $32.2 g$ (2) $69.4 g$ (3) $91.5g$ (4) $162.5 g$ 36. $Two students X and Y report the mass of the same substance as 7.0 g and 7.00 g respectively, which of the following statement is correct?$ (1) $Both are equally accurate$ (2) $X is more accurate than Y$ (3) $Y is more accurate than X$ (4) $Both are inaccurate scientifically$ 37. $1.0 g of Mg is burnt with 0.28 g of O_{2} in a closed vessel. Which reactant is left in excess and how much?$ (1) $Mg, 5.8 g$ (2) $Mg, 0.58 g$ (3) $O_{2}, 0.24 g$ (4) $O_{2}, 2.4 g$ 38. $A commercially sold cone. HC1 is 35% HC1 by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is : (Atomic mass : Cl = 35.5 amu, H = 1 amu)$ (1) $10.2 M$ (2) $12.5 M$ (3) $14.0M$ (4) $18.2M$ 39. $The total number of valence electrons in 4.2 g of N_{3}^{-} ion is (N_{A} is the Avogadro’s number)$ (1) $2.1 N_{A}$ (2) $4.2 N_{A}$ (3) $1.6 N_{A}$ (4) $3.2 N_{A}$ 40. $One gram of silver gets distributed between 10 cm^{3} of molten zinc and 100 cm^{3} of molten lead of 800^{\circ} C . The percentage of silver in the zinc layer is approximately$ (1) $89$ (2) $91$ (3) $97$ (4) $94$ 41. $The number of gram molecules of chlorine in 6.02 \times 10^{25} hydrogen chloride molecules is$ (1) $10$ (2) $100$ (3) $50$ (4) $5$ 42. $18.72 g of a substance ‘X’ occupies 1.81 c m^{3} . What will be its density measured in correct significant figures?$ (1) $10.3 g c m^{- 3}$ (2) $10.34 g c m^{- 3}$ (3) $10.4 g c m^{- 3}$ (4) $10.3425 g c m^{- 3}$ 43. $The vapour density of N_{2} O_{4} in N_{2} O_{4} ⇌ 2 NO_{2} is 40 . The degree of dissociation is$ (1) $1.25$ (2) $2.50$ (3) $1.50$ (4) $0.15$ 44. $The result of the operation 2.5 \times 1.25 should be which of the following on the basis of significant figures?$ (1) $3.125$ (2) $3.13$ (3) $3.1$ (4) $31.25$ 45. $Which one of the followings has maximum number of atoms?$ (1) $1 g of Mg (s) [Atomic mass of Mg = 24]$ (2) $1 g of O_{2} (g) [Atomic mass of O = 16]$ (3) $1 g of Li (s) [Atomic mass of Li = 7]$ (4) $1 g of Ag (s) [Atomic mass of Ag = 108]$ 46. $Which one of the following has maximum number of atoms of oxygen?$ (1) $2 g of carbon monoxide$ (2) $2 g of carbon dioxide$ (3) $2 g of sulphur dioxide$ (4) $2 g of water$ 47. $The number of significant figures in value of π are:$ (1) $1$ (2) $2$ (3) $3$ (4) $\infty$ 48. $Production of iron in blast furnace follows the following equation F e_{3} O_{4} (s) + 4CO(g) \to 3Fe(l) + 4 C O_{2} (g) when 4.640 kg of F e_{3} O_{4} and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is :[Given : Molar Atomic mass (g m o l^{- 1}): Fe = 56 Molar Atomic mass (g m o l^{- 1}) : O = 16 Molar Atomic mass (g m o l^{- 1}): = C = 12$ (1) $1400$ (2) $2200$ (3) $3360$ (4) $4200$ 49. $50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is :$ (1) $40 g$ (2) $10 g$ (3) $20 g$ (4) $4g$ 50. $In the reaction 2 A I_{(s)} + 6 H C l_{(a q)} \to 2 A l_{(a q)}^{3 +} + 6 C l_{(a q)}^{-} + 3 H_{2} (g)$ (1) $6L H C l_{(a q)} is consumed for every 3L H_{2} produced.$ (2) $33.6 L H_{2 (g)} is produced regardless temperature and pressure for every moles that reacts.$ (3) $67.2 L H_{2 (g)} at STP is produced for every mole of Al that reacts.$ (4) $11.2 L H_{2 (g)} at STP is produced for every mole of H C l_{(a q)} consumed.$ 51. $0.30 g of an organic compound containing C, H and O on combustion yields 0.44 g CO_{2} and 0.18 g H_{2} O . If one mol of compound weighs 60 , then molecular formula of the compound is$ (1) $C_{3} H_{8} O$ (2) $C_{2} H_{4} O_{2}$ (3) $CH_{2} O$ (4) $C_{4} H_{6} O$ 52. $What is the mass ratio of ethylene glycol (C_{2} H_{6} O_{2}, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution ?$ (1) $1 : 1$ (2) $3: 1$ (3) $2 : 1$ (4) $1 : 2$ 53. $10 g of a mixture of BaO and CaO requires 100 cm^{3} of 2.5 MHCl to react completely. The percentage of calcium oxide in the mixture is approximately (Given: molar mass of BaO = 153)$ (1) $52.6$ (2) $55.1$ (3) $44.9$ (4) $47.4$ 54. $What is the quantity of hydrogen gas liberated when 46 g sodium reacts with excess ethanol? (Given At. mass of Na = 23)$ (1) $2.4 \times 10^{- 3} kg$ (2) $4.0 \times 10^{- 3} kg$ (3) $2.0 \times 10^{- 3} kg$ (4) $2.4 \times 10^{- 2} kg$ 55. $At S.T.P. the density of C C l_{4} vapour in g / L will be nearest to$ (1) $6.87$ (2) $3.42$ (3) $10.26$ (4) $4.57$ 56. $Excess of silver nitrate solution is added to 100 mL . of 0.01 M Pentaaquachloro chromium(III) chloride solution. The mass of silver chloride obtained in grams is [Atomic mass of silver is 108 .]$ (1) $287 \times 10^{- 3}$ (2) $143.5 \times 10^{- 3}$ (3) $143.5 \times 10^{- 2}$ (4) $287 \times 10^{- 2}$ 57. $Density of 3 M NaCl solution is 1.25 g / mL . The molality of the solution is:$ (1) $1.79 m$ (2) $2.79 m$ (3) $2 m$ (4) $3 m$ 58. $The number of atoms in 4.25 g of N H_{3} is approximately$ (1) $4 \times 1 0^{23}$ (2) $2 \times 1 0^{23}$ (3) $1 \times 1 0^{23}$ (4) $6 \times 1 0^{23}$ 59. $Combustion of 10 ml of a gaseous hydrocarbon gives 40 ml of CO_{2} and 50 ml of water vapour under the same conditions. The molecular formula of the hydrocarbon is$ (1) $C_{4} H_{6}$ (2) $C_{4} H_{8}$ (3) $C_{3} H_{4}$ (4) $C_{4} H_{10}$ 60. $The mass of AgCl precipitated when a solution containing 11.70 g of NaCl is added to a solution containing 3.4 g of AgNO_{3} is [Atomic mass of Ag = 108, Atomic mass of Na = 23]$ (1) $5.74 g$ (2) $1.17 g$ (3) $2.87 g$ (4) $6.8 g$