chemistry MCQs – Page 3

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
41. Which of the following is pseudo solid_____________________?
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A. CaF2

B. Diamond

C. NaCl

D. Glass
42. Which of the following solids show anisotropy___________________?
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A. Plastic

B. None of the above

C. Rubber

D. Glass

43. Which of the following can be used in laptops ?
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A. Fuel cell

B. Silver oxide battery

C. Nickel cadmium cell

D. Lead accumulator

44. Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?
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A. two / three

B. one / seventeen

C. one / three

D. sixteen / seventeen

45. Covalent network crystals have_____________?
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A. higher melting point then molecular crystals

B. discrete molecules linked by Van der waals forces

C. hydrogen bonding

D. lower melting point then molecular crystals

46. Empirical formula of chloroform is____________________?
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A. CHCL3

B. CH3C1

C. CC14

D. CH2 C12

47. Dempsters mass spectrometer has number of zones / parts_________________?
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A. 4

B. 5

C. 2

D. 3

48. The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
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A. no reaction

B. Be+H2O?Be (OH)2+H2

C. Be+H2O?[Be (OH)4]+2+H2

D. Be+2H2O?Be (OH)2+H2

49. When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?
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A. 1

B. 0.5

C. 1.5

D. 2
50. Atomic radius can be determined by_________________?
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A. Electron microscope

B. X ray diffraction

C. Optical microscope

D. Spectrophotometer

51. Which one of the following has the maximum number of isotopes ?
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A. carbon

B. oxygen

C. chlorine

D. tin
52. All of the following substances are crystalline except_____________?
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A. Ice

B. Plastic

C. Diamond

D. Sucrose

53. A limiting reactant is one which________________?
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A. is taken in lesser quantity in grams as compared to other reactants

B. gives the maximum amount of the product which is required

C. gives the minimum amount of the product under consideration

D. is taken in lesser quantity in volume as compared to other reactants

54. moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?
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A. 0.18 mole

B. 0.27 mole

C. 0.09 mole

D. 0.24 mole

55. Which catalyst is used in contact process ?
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A. SO3

B. Fe2O3

C. V2O5

D. Ag2O

56. When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?
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A. 0.33 nm

B. 0.34 nm

C. 0.36 nm

D. 0.35 nm

57. Which of the following molecule is polar__________________?
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A. BF3

B. CO2

C. none of the above

D. CCI4

58. Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?
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A. 20cm3/min

B. 2.5cm3/min

C. 40cm3/min

D. 160cm3/min

59. In the complex [Cr(OH)3(H2O)3] the coordination number is __________________?
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A. 3

B. 6

C. 2

D. 4

60. All the following variables are used to describle gases except__________________?
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A. pressure

B. volume

C. density

D. moles