chemistry MCQs – Page 54

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 Review each marked answer and report any item that may be outdated or unclear.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
1061. The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:_______?
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A. Chlorine

B. Fluorine

C. Bromine

D. Sulphur
1062. Grignard reagent gives carboxylic acid with____________?
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A. CO2

B. HCN

C. CH3CHO

D. COC2

1063. Which alkyl halide out of the following may follow both SN1 and SN2 mechanism ?
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A. (CH3)3 C-CH2 X

B. CH3-X

C. (CH3)2 CH X

D. (CH3)3 C X

1064. Which group contains elements that exist as monoatomic molecule?
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A. 1

B. 18

C. 2

D. 14

1065. The science of fermentation is called _______ ?
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A. Zymurgy

B. Zymology

C. Zootaxy

D. Zygology

1066. Alkanes are also known as________________?
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A. saturated hydrocarbon

B. unsaturated hydrocarbon

C. paraffins

D. both A & C

1067. Which alkyl halide has the highest reactivity for a particular alkyl group ?
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A. R-C

B. R-F

C. R-Br

D. R-I
1068. The easy way of balancing the chemical equation is_________?
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A. None of the above

B. according to atoms atomic number.

C. According to atoms atomic mass.

D. First we balance Metal than non-metal than Hydrogen than Oxygen.
1069. Alkyl halides undergo a type of reaction_________________?
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A. Nucleophilic substitution

B. Nucleophilic addition

C. Elimination

D. both A & C
1070. Which of the following represents the correct electronic configuration of VII A group elements in the ground state ?
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A. ns2p4

B. ns2p5

C. ns2p6

D. ns2p2

1071. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in__________?
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A. 12 moles of KMnO4

B. 1.8 gram of H<sub>2</sub>O

C. 4.6 gram of C<sub>2</sub>H<sub>5</sub>OH

D. 0.6N H<sub>2</sub>SO<sub>4</sub>

1072. An alcohol which can be prepared by fermentation is_________________?
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A. C6H5OH

B. C3H7OH

C. CH3OH

D. CH3 CH2 OH
1073. Magnetic quantum number specifies___________?
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A. Orientation of orbitals

B. Shape of orbitals

C. Size of orbitals

D. All of the above

1074. Which compound shows hydrogen bonding ?
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A. C2H5Cl

B. C2H6

C. CH3OCH3

D. C2H5OH
1075. Reactivity due to pi-electrons is present in_________________?
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A. alkane

B. alkene

C. alkyne

D. both B & C
1076. When an aldehyde is reacted with hydrogen cyanide a Cyanihydrin is formed. This process is best termed as __________?
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A. Electrophilic substitution

B. Necleophilic substitution

C. Nucleophilic addition

D. Electrophilic addition

1077. Chlorine Cl when attached to benzene has________?
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A. +I and +R effect

B. -1 and +R effect

C. +1 and -R effect

D. -I and -R effect

1078. The colour of chlorine gas is_______________?
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A. grayish black

B. freenish yellow

C. pale yellow

D. reddish brown

1079. Among the halogens the rare element is________________?
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A. Chlorine

B. Fluorine

C. Astatine

D. Iodine

1080. The molecular formula for cholesterol is C27 H46 O. What are the degrees of unsaturation for this compound?
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A. 5

B. 7

C. 8

D. 6