chemistry Mcqs
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

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

79. Which of the following theories is superior to others__________________?
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A. VSEPR

B. MOT

C. none of the above

D. VBT

80. Which of the following statements about isotopes is correct ?
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A. Isotopes with odd atomic number and even mass number are abundant

B. Isotopes with even atomic number and even mass number are abundant

C. Isotopes with odd atomic number are abundant

D. Isotopes with even atomic number and odd mass no are abundant

81. Which of the following is not a macromolecule ?
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A. diamond

B. sand

C. maltose

D. haemoglobin

82. Nitrates of which pair gives different products on thermal decomposition___________________?
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A. Mg Ca

B. Li Na

C. Li Ca

D. Na K

83. Isotopes differ in_________________?
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A. arrangement of electrons in orbitals

B. properties which depend upon mass

C. chemical properties

D. all of the above

84. Compound containing benzene ring in their structure are __________________?
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A. carbohydrates

B. carboxylic acid

C. aliphatic

D. aromatic
85. 1 a.m.u =__________________?
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A. 1.6 x 10-26 kg

B. 1.6 x 10-27 kg

C. 1.6 x 10-24 kg

D. 1.6 x 10-28 kg

86. Main source of organic compounds is__________________?
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A. Fossil

B. Animal

C. Plants

D. Coal

87. The number of atoms in a molecule determines________________?
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A. atomicity

B. macromolecule

C. molecularity

D. macromolecule

88. Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?
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A. 1s2 2s2 2p6 3s2 3p6 4s23d5

B. 1s2 2s2 2p6 3s2 3p6 3d7

C. 1s2 2s2 2p6 3s2 3p6 4s2 4p5

D. 1s2 2s2 2p6 3s2 3p5 3d10

89. When benzene is heated in air with V2O5 at 450C yields_________________?
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A. Phenol

B. Glyoxal

C. Maleic anhydride

D. Benzoic acid

90. Which of the following is mineral fiber ?
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A. saran

B. Teflon

C. asbestos

D. acrylic

91. The most reactive allotropic form of phosphorus is________________?
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A. White

B. Black

C. Redox potential

D. Violet

92. Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?
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A. Quantum structure

B. Secondary structure

C. Primary structure

D. Tertiary structure

93. Which one of the following will be sulphonated readily ?
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A. Chlorobenzene

B. Nitrobenzene

C. Toluene

D. Benzene

94. Quantum number values for 3p orbitals are____________________?
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A. n=3 l=3

B. n=3 l=2

C. n=3 l=1

D. n=3 l=0

95. The nucleus of an atom of every element will always contain____________________?
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A. protons and neutrons

B. protons

C. protons and electrons

D. neutrons

96. Which one of the following is not a good leaving group ?
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A. Br-

B. Cl-

C. HSO4-

D. OH-
97. A solution can be both____________________?
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A. saturated and unsaturated

B. saturated and super saturated

C. dilute and concentrated

D. dilute and saturated

98. Which of the following is the formula of chrome red ?
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A. Pb2O

B. Pb3 O4

C. Pb Cr O4 Pb (OH)2

D. 2Pb CO3 Pb (OH)2

99. A real gas obeying vander waals equation will resemble the ideal gas if_______________________?
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A. Both a and b are small

B. Both a and b are large

C. a is small and b is large

D. a is large and b is small

100. When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?
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A. 2

B. 1

C. 3

D. 4