Chemistry Exam - Question
Q106. Haloarenes are more stable than haloalkanes due to
(a) Resonance effect
(b) Inductive effect
(c) Hyper conjugative effect
(d) All of them
Answer: (a) Resonance effect
Q107. The reaction intermediate formed during the preparation of diethylether from ethanol by tratment with H2SO4 is
(a) Carbanion
(b) Carbocation
(c) Carbene
(d) Free radical
Answer: (b) Carbocation
Q108. Of the following compounds of calcium, the one having highest covalent character is
(a) CaF2
(b) Cacl2
(c) CaBr2
(d) Cal2
Answer: (d) Cal2
Q109. The strongest acid of the following is
(a) p-chlorophenol
(b) m-nitrophenol
(c) p-nitrophenol
(d) o-nitrophenol
Answer: (c) p-nitrophenol
Q110. Basicity of boric acid, H3BO3 is
(a) 2
(b) 3
(c) 4
(d) 5
Answer: (a) 2
Q111. The most volatile of the given liquids is
(a) ether
(b) liquid
(c) liquid NH3
(d) liquid He
Answer: (d) liquid He
Q112. Which of the following is not an addition polymer
(a) Nylon
(b) PVC
(c) Polythene
(d) Polystyrene
Answer: (a) Nylon
Q113. The metal present in vitamin B12 is
(a) Fe
(b) Co
(c) Mg
(d) Mo
Answer: (b) Co
Q114. Which of the following is not present in RNA
(a) Thymine
(b) Uracil
(c) Ribose
(d) Phosphate
Answer: (a) Thymine
Q115. Molality of pure water is
(a) 18.00
(b) 1.80
(c) 5.55
(d) 55.5
Answer: (d) 55.5
Q116. Which of the following molecules has a bond order of 2.5
(a) HCL
(b) CO
(c) F2
(d) NO
Answer: (c) F2
Q117. 0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by
(a) 3
(b) 4
(c) 6
(d) 7
Answer: (b) 4
Q118. If a buffer solution is diluted its pH
(a) is increased
(b) remains same
(c) is decreased
(d) will slowly increase and then it will decrease
Answer: (b) remains same
Q119. The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas
(a) remains unchanged
(b) will be doubled
(c) will increase four-fold
(d) will be reduced to half
Answer: (c) will increase four-fold
Q120. Forth floatation process to concentrate the minerals is applicable to
(a) Calamine
(b) Chalcopyrites
(c) Bauxite
(d) Haematite
Answer: (b) Chalcopyrites