chemistry MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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