CHEMISTRY
71. The molecule which has the largest dipole moment is
(a) CHCl3
(b) CHl3
(c) CH4
(d) CCl4
+
72. The bond order in O2 is
(a) 2
(b) 2.5
(c) 1.5
(d) 3
2+
73. The number of d-electrons retained in Fe (Atomic number of Fe=26) ion is
(a) 3
(b) 4
(c) 5
(d) 6
74. The compound having lowest boiling point is
(a) NH3
(b) AsH3
(c) SbH3
(d) BiH3
75. Which of the following oxides of nitrogen is the anhydride of nitrous acid?
(a) NO
(b) N2O3
(c) N2O4
(d) N2O5
76. When iodine reacts with concentrated HNO3, the product is
(a) Periodic acid
(b) Iodic acid
(c) Hydroiodic acid
(d) Nitrous acid
77. H2O2 cannot act as
(a) Oxidising agent
(b) Reducing agent
(c) Acid
(d) Dehydrating agent
78. Which of the following statements belongs to VSEPR theory?
(a) This theory does not predict the shape of covalent molecules
(b) The electron pairs surrounding the central atom repel each other as far apart as possible
(c) Repulsion between two ion pairs of electrons is less than that between two bond pairs of electrons
(d) All of these
79. White phosphorous (P4) does not contain
(a) Six P-P single bonds
(b) Four P-P single bonds
(c) Four ion pairs of electrons
(d) PPP angle of 60°
80. Electromagnetic waves with maximum wave length are
(a) UV radiations
(b) Radio waves
(c) X- rays
(d) IR radiations
81. Which one of the following compounds has highest lattice energy?
(a) LiF
(b) CsF
(c) RbF
(d) NaF
82. Which one of the following does not have tetrahedral arrangement of atoms?
(a) Diamond
(b) Graphite
(c) Methane
(d) Ethane
83. Viscosity of a liquid
(a) Increases with increase in temperature
(b) Decreases with increase in temperature
(c) Independent of temperature
(d) Decreases with increase in pressure
84. Which of the following processes is accompanied by decrease in entropy?
(a) Burning of Rocket –fuel
(b) Sublimation of dry ice
(c) Dissolution of NH4Cl in water
(d) Condensing steam
85. 25 ml of a solution of barium hydroxide on titration with 0.1 molar solution of HCl gave a
titre value of 35 ml. The molarity of barium hydroxide solution was—
(a) 0.07
(b) 0.14
(c) 0.28
86. Which of the following is a collegative property?
(d) 0.35
(a) Surface tension
(b) Osmotic pressure
(c) Optical rotation
(d) Viscosity
87. A catalyst increases the rate of a chemical reaction by
(a) Increasing the activation energy (b) Decreasing the activation energy
(c) Reacting with reactants
(d) Reacting with product
88. Milk is an example of
(a) Foam
(b) Suspension
(c) Emulsion
(d) Gel
89. Standard reduction potential of three metals A, B and C are +0.5 V, -3.0 V and -1.2 V respectively.
The reducing power of these metals are
(a) B > C > A
(b) A > B > C
(c) C > B > A
(d) A > C > B
(c) 931 MeV
(d) 31 MeV
90. 1 a.m.u. is equivalent to
(a) 130 MeV
(b) 39 MeV
91. The alkane which cannot show chain isomerism is
(a) Pentane
(b) Butane
(c) Propane
(d) All of these
92. Hofmann’s bromamide reaction involves
(a) Decrease in carbon atoms
(b) Increase in carbon atoms
(c) Both of these
(d) None of these
93. Which of the following dihalides on hydrolysis with aqueous KOH gives ethylene glycol?
(a) Ethylene chloride
(b) Ethylidene chloride
(c) Isopropylidene chloride (d) None of these
94. The IUPAC name of CH3COCH (CH3)2—
(a) Isopropyl methyl ketone
(b) 2-methyl -3-butanone (c) 4-methyl -3-butanone (d) 3-methyl -2-butanone
95. Which of the following carbocations is most stable?
(a) Tertiary butyl carbocation
(b) Triphenyl carbocation
(c) Benzyl carbocation
(d) Allyl carbocation
96. Which one of the following does not contain –COOH group?
(a) Picric acid
(b) Asprin
(c) Benzoic acid
(d) Ethanoic acid
(c) CH2=CHCl
(d) CHCl3
97. The carbylamines reaction is given by
(a) CCl4
(b) CH3Cl
98. Which of the following is strongest acid?
(a) Formic acid
(b) Acetic acid
(c) Propionic acid
(d) n-Butyric acid
(c) Nylon-6
(d) Orlon
99. Chloroprene is used to synthesize
(a)Neoprene
(b) Dacron
100. Several blocks of magnesium are fixed to the bottom of a ship to
(a) Keep away the sharks
(b) Make the ship lighter
(c) Prevent action of water and salt
(d) Prevent puncturing by undersea rocks