12th class (Fsc) Chemistry unit 7 MCQs
101. Aromatic compounds burn with smoothly flame because:
a. They have high percentage of carbon
b. They have percentage of hydrogen
c. They resist reaction with air
d. They have a ring structure
102. The process used to improve quality of gasoline:
a. Steam cracking
b. Thermal cracking
c. Combustion
d. Reforming
103. Urea belong to which class of compounds?
a. Amides
b. Limedes
c. Carboxyluic acid
d. Amines
104. Linear shape is associated with which set of hybrid orbitals:
a. Sp3
b. Sp
c. DSp2
d. Sp2
105. The state of chorization of carbon atom in ethane is:
a. Sp
b. Sp3
c. Dsp2
d. Sp2
106. Which set of hybrid orbitals produces octahedral geometry:
a. Dsp2
b. Dsp3
c. Sp3
d. D2sp3
107. A double bond consist of:
a. 2 pi bond
b. 1 sigma and 1 pi bond
c. 2 sigma bond
d. None of these
108. Carbon atom in dimethyl ether is:
a. Sp3 – hybridized
b. Sp hybridized
c. Sp2 – hybridized
d. None
109. The state of hybridization of carbon atom in ethene is:
a. Sp
b. Sp3
c. Dsp2
d. Sp2
110. Number of isomers of C4 H10 is:
a. 3
b. 1
c. 4
d. 2
111. Ethars shows the phenomenon of:
a. Position isomerism
b. Metamerism
c. Both
d. Chain isomerism
112. In-t-butyl alcohol, the tertiary carbon is bonded to:
a. One H atoms
b. Three Hatoms
c. None H-atoms
d. Two H-atoms
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