chemistry MCQs – Page 4

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 Review each marked answer and report any item that may be outdated or unclear.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

61. Across short period the melting and boiling point increase upto __________________?
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A. VA group

B. IIIA group

C. IVA group

D. VIA group

62. Which of the following elements react with steam to produce H2 gas?
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A. Ni

B. All of the above

C. Pd

D. Sn

63. When toluene reacts with chlorine in sunlight the first major product is__________________?
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A. Benzal dichloride

B. O-chlorotoluene and P-chlorotoluene

C. Benzy1 chloride

D. O-chlorotoluene

64. When chlorine is passed through hot solution of caustic soda the reaction is said as___________________?
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A. Displacement

B. Double displacement reaction

C. Disproportionation reaction

D. Reduction

65. Methane is used in power generation in chemical industries being a__________________?
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A. natural gas

B. good caloric value

C. cheaper

D. All

66. Hydro carbons which burn with smoky flame are called_________________?
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A. Aliphatic

B. Aromatic

C. Alicyclic

D. an data-mce-type="bookmark" style="width: 0px;overflow: hidden;line-height: 0" class="mce_SELRES_start">?</span>D. Aldehyde

67. Which one is true about isotope ?
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A. Same physical properties

B. Same chemical properties

C. Same number of neutrons

D. Same mass number

68. The mass of one mole of electron is________________?
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A. 0.55

B. 1.008

C. 0.184

D. 1.637

69. Plasma is used in_________________?
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A. Lasers

B. Fluorescent bulb

C. Neon signs

D. All of these

70. Which is the unit of (K) rate constant for zero order reaction ?
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A. mol dm-3 s-1

B. s-1

C. mol-2 dm6 s-1

D. mol-1 dm3 s-1

71. For which of the following compounds the term empirical formula cannot be applied ?
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A. NaCl

B. CCI4

C. It can be applied to all mentioned above

D. H2O

72. Which element has same isotopes like palladium___________________?
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A. Calcium

B. Cadmium

C. Nickel

D. Tin

73. The precess in which larger molecule with higher molecular weight breaks down into smaller moleucles with lower molecular weight____________________?
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A. pyrolysis

B. no such process occurs

C. isomerism

D. polymerization

74. Isotopes of the same elements has__________________?
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A. different number of protons

B. same mass number (nucleon number)

C. different number of neutrons

D. same number of neutrons

75. Which molecule has the highest bond energy among the halogens_________________?
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A. Chlorine

B. Bromine

C. Fluorine

D. Iodine

76. Which statement is consistent with Hunds rule ?
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A. There is maximum of two electrons is an orbital.

B. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.

C. None

D. The electrons in the same atom cannot have the same four quantum numbers

77. Qualitative analysis is carried out for _________________?
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A. estimation of amounts of elements

B. identification of elements

C. molar ration of elements

D. molar volume of elements

78. Which of the following terms is not used for ionic compound ?
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A. formula mass

B. molecular formula

C. formula unit

D. empirical formula