General Knowledge Quiz: Chemistry Quiz

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Thursday, May 16, 2013

Considering the reaction C(S) +O2(g)¾® CO2(g)+393.5 kJ the signs of DH , DS and DG respectively are -, +, -

171. Considering the reaction C(S) +O2(g)¾® CO2(g)+393.5 kJ the signs of DH , DS and DG respectively are

(A) -, +, -

(B) -, -, -

(D) +, -, -

Answer:: (A)

172. Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

(A) CH3 - CH2 - CH2 - CH3

(B) CH3 - CH = CH - CH3

(D) CH2 = CH - CH2 - C º CH

Answer:: (C)

173. Cooking is fast in a pressure cooker, because

(A) food is cooked at constant volume.

(B) loss of heat due to radiation is minimum.

(D) water boils at higher temperature inside the pressure cooker.

Answer:: (D)

178. Dalda is prepared from oils by

(A) oxidation

(B) reduction

(D) distillation

Answer:: (B)

179. Dalton's law of partial pressures is applicable to which one of the following systems?

(A) CO + H2

(B) H2 + Cl2

(D) NH3 + HCl

Answer:: (A)

180. Decomposition of benzene diozonium chloride by using Cu2Cl2/HCl to form chlorobenzene is

(A) Cannizarro's reaction

(B) Kolbe's reaction

(D) Raschig's reaction

Answer:: (C)

CH3CH2Br A B C C D; "D" is CH3NH2

161. CH3CH2Br A B C C D; "D" is _____.

(A) CH3CONH2

(B) CH3Br

(D) CH3NH2

Answer:: (D)

162. CH3COOH ln the above reaction Z is

(A) Ketol

(B) Acetal

(D) Aldol

Answer:: (D)

163. Chloroacetic acid is a stronger acid than acetic acid. This can be explained using ______.

(A) - I effect

(B) - M effect

(D) + M effect

Answer:: (A)

164. Clemmensen reduction of a ketone is carried out in the presence of which of the following?

(A) H2 and Pt as catalyst

(B) Glycol with KOH

(D) LiAlH4

Answer:: (C)

165. 0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is ______.

(A) 8

(B) 10

(D) 9

Answer:: (C)

166. 2 gm of metal carbonate is neutralized completely by 100 ml of 0.1 (N) HCI. The equivalent weight of metal carbonate is

(A) 50

(B) 100

(D) 200

Answer:: (D)

167. 25 g of each of the following gasses are taken at 27oC and 600 mm pressure. Which of these will have the least volume?

(A) HCl

(B) HBr

(D) HF

Answer:: (C)

168. 4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases present at equilibrium is

(A) 6.5

(B) 7.0

(D) 2.0

Answer:: (B)

169. A distinctive and characteristic functional group of fats is

(A) a peptide group

(B) an ester group

(D) a ketonic group

Answer:: (B)

170. Consider the following gaseous equilibria with equilibrium constants K1 and K2 respectively. SO2(g) + Ý SO3(g) 2SO3(g) Ý 2SO2(g) + O2(g) The equilibrium onstants are related as ______.

(A) 2K1 =

(B)

(C)

(D)

Answer:: (B)

The spin only magnetic moment of Fe2+ ion (in BM) is approximately 5

153. The spin only magnetic moment of Fe2+ ion (in BM) is approximately

(A) 7

(B) 4

(D) 5

Answer:: (D)

154. Benzaldehyde and acetone can be best distinguished using ______.

(A) sodium hydroxide solution

(B) Fehling's solution

(D) 2, 4-DNPH

Answer:: (C)

156. Benzene reacts with chlorine in sunlight to give a final product

(A) C6H5Cl

(B) C6Cl6

(D) CCl4

Answer:: (C)

157. By what factors does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

(A) 1.4

(B) 2.0

(D) 4.0

Answer:: (A)

158. Carbon can reduce ferric oxide to iron at a temperature above 983 K because ______.

(A) carbon has a higher affinity towards oxidation than iron.

(B) carbon monoxide formed is thermodynamically less stable than ferric oxide.

(D) free energy change for the formation of carbon dioxide is less negative than that for ferric oxide.

Answer:: (A)

159. Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?

(A) carbon

(B) oxygen

(D) both carbon and oxygen

Answer:: (B)

160. Catalytic dehydrogenation of a primary alcohol gives a

(A) secondary alcohol

(B) aldehyde

(D) ester

Answer:: (B)

Arrange the following in the increasing order of their bond order: O2, O, O and O, O, O2 O

147. Arrange the following in the increasing order of their bond order: O2, O, O and O

(A) O,O2, O,O

(B) O2, O, O, O

(D) O, O, O, O2

Answer:: (C)

148. Based on the first law of thermodynamics, which one of the following is correct?

(A) For an adiabatic process: DU = -w

(B) For an isochoric process: DU = -q

(D) For an isothermal process: q = +w

Answer:: (C)

149. The yellow precipitate formed during the chromyl chloride test is chemically

(A) lead chromate

(B) chromic acid

(D) lead acetate

Answer:: (A)

150. The typical range of molar enthalpies for the strongest intermolecular (Hydrogen) bonds is

(A) 200 – 300 kJ

(B) 300 – 500 kJ

(D) 4 – 25 J

Answer:: (C)

151. The time required for 100% completion of a zero order reaction is

(A) a/2k

(B) ak

(D) a/k

Answer:: (D)

152. The standard emf of a galvanic cell involving 2 moles of electrons in its rodox reaction is 0.59 V. The equilibrium constant for the redox reaction of the cell is

(A) 105

(B) 1020

(D) 10

Answer:: (B)

An octahedral complex is formed when hybrid orbitals of the following type are involved d2sp3

140. An octahedral complex is formed when hybrid orbitals of the following type are involved

(A) sp3

(B) d sp2

(D) sp2d2

Answer:: (C)

141. An organic compound on heating with CuO produces CO2 but no water. The organic compound may be

(A) Methane

(B) Ethyl iodide

(D) Chloroform

Answer:: (C)

142. An organic compound X is oxidised by using acidified K2Cr2O7. The product obtained reacts with Phenyl hydrazine but does not Answer: silver mirror test. The possible structure of X is

(A) (CH3)2CHOH

(B) CH3CHO

(D) CH3 ¾ ¾ CH3

Answer:: (A)

143. An oxygen containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

(A) a primary alcohol

(B) an aldehyde

(D) a secondary alcohol

Answer:: (A)

144. Anisole can be prepared by the action of methyl iodide on sodium phenate. The reaction is called

(A) Wurtz's reaction

(B) Williamson's reaction

(D) Etard's reaction

Answer:: (B)

145. Argon is used

(A) in high temperature welding

(B) in radiotherapy for treatment of cancer

(D) to obtain low temperature

Answer:: (A)

146. Arrange the following in the increasing order of their basic strengths : CH3NH2, (CH3)2NH, (CH3)3N, NH3

(A) (CH3)3N < NH3 < CH3NH2 < (CH3)2 NH

(B) CH3NH2 < (CH3)2NH < (CH3)3N < NH3

(D) NH3 < (CH3)3N < CH3NH2 < (CH3)2NH

Answer:: (D)

An element with atomic number 21 is a transition element

133. An element with atomic number 21 is a

(A) halogen

(B) representative element

(D) alkali metal

Answer:: (C)

134. The sp3d2 hybridization of central atom of a molecule would lead to

(A) square planar geometry

(B) Tetrahedral geometry

(D) Octahedral geometry

Answer:: (D)

135. The reagent with which both acetaldehyde and acetone react is

(A) I2/NaOH

(B) Fehling's reaction

(D) Tollen's reagent

Answer:: (A)

136. The ozone layer forms naturally by

(A) the interaction of CFC with oxygen

(B) the interaction of UV radiation with oxygen

(D) the interaction of oxygen and water vapour

Answer:: (B)

137. The number of naturally occurring p-block elements that are diamagnetic is ______.

(A) 6

(B) 18

(D) 5

Answer:: (D)

138. The normality of 30 volume H2O2 is

(A) 2.678 N

(B) 5.336 N

(D) 6.685 N

Answer:: (B)

139. An ionic compound is expected to have tetrahedral structure if lies in the range of

(A) 0.414 to 0.732

(B) 0.225 to 0.414

(D) 0.732 to 1

Answer:: (B)

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of N and S

127. Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

(A) S

(B) N

(D) S and Cl

Answer:: (C)

128. Amines behave as

(A) Lewis acids

(B) Lewis base

(D) neutral compound

Answer:: (B)

129. Among the following, the compound that contains ionic, covalent and coordinate linkage is

(A) NaCl

(B) CaO

(D) NH4Cl

Answer:: (D)

130. Among the following, which is least acidic?

(A) phenol

(B) O-cresol

(D) p-chlorophenol

Answer:: (B)

131. An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be

(A) a primary amine

(B) a secondary amine-

(D) a mixture of all the three

Answer:: (D)

132. An aqueous solution containing 6.5 gm of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is

(A) 100 cm3

(B) 200 cm3

(D) 2000 cm3

Answer:: (A)

Which is not the correct statement about RNA and DNA?

120. Which is not the correct statement about RNA and DNA?

(A) DNA is active in virus where RNA never appears in virus

(B) DNA exists as dimer while RNA is usually single stranded

(D) RNA contains uracil in place of thymine (found in DNA) as a base

Answer:: (A)

121. Which cycloalkane has the lowest heat of combustion per CH2 group?

(A) cyclopropane

(B) cyclobutanc

(D) cyclohexane

Answer:: (D)

122. When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is

(A) acetophenone

(B) benzaldehyde

(D) acetaldehyde

Answer:: (A)

123. What is the nature of glucose-glucose linkage in starch that makes its so susceptible to acid hydrolysis?

(A) Starch is hemiacetal

(B) Starch is acetal

(D) Starch contains only few molecules of glucose

Answer:: (B)

124. A white crystalline salt A reacts with dilute HCI to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute H2SO4 to a green coloured solution C. A, B and C are respectively ______.

(A) Na2S2O3, SO2, Cr2 (SO4)3

(B) Na2SO3, SO2, Cr2 (SO4)3

(D) Na2S, SO, Cr2 (SO4)3

Answer:: (A)

125. According to Bayer's strain theory which is highly stable?

(A) cyclohexane

(B) cycloheptane

(D) cyclobutane

Answer:: (C)

126. Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

(A) CrSO4

(B) Cr2(SO4)3

(C)

(D) Cr2(SO3)3

Answer:: (B)

A gas deviates from ideal behaviour at a high pressure because its molecules

114. A gas deviates from ideal behaviour at a high pressure because its molecules

(A) attract one another

(B) show the Tyndall effect

(D) are bound by covalent bonds

Answer:: (A)

115. A gaseous mixture was prepared by taking equal mole of CO and N2. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N2) in the mixture is

(A) 1 atm

(B) 0.5 atm

(D) 0.9 atm

Answer:: (B)

116. A ligand can also be regarded as

(A) Lewis acid

(B) Bronsted base

(D) Bronsted acid

Answer:: (C)

117. A metal present in insulin is

(A) copper

(B) iron

(D) aluminium

Answer:: (C)

118. A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca+2 ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture (atomic mass of Ca = 40) is ______.

(A) 30.6

(B) 75

(D) 25

Answer:: (B)

119. Which of the following compound would not evolve CO2 when treated with NaHCO3 solution?

(A) salicylic acid

(B) phenol

(D) 4-nitro benzoic acid

Answer:: (B)

Which of the following gives an aldehyde on dry distillation?

107. Which of the following gives an aldehyde on dry distillation?

(A) Calcium acetate + calcium benzoate

(B) Calcium formate + calcium acetate

(D) Calcium acetate

Answer:: (B)

108. Which of the following does not give benzoic acid on hydrolysis?

(A) phenyl cyanide

(B) benzoyl chloride

(D) methyl benzoate

Answer:: (C)

109. A compound is formed by elements A and B. This crystallises in the cubic structure where the A atoms are at the comers of the cube and B atoms are at the body centres. The simplest formula of the compound is

(A) AB

(B) A6B

(D) AB6

Answer:: (A)

110 A compound of 'A' and 'B' crystallises in a cubic lattice in which the 'A' atoms occupy the lattice points at the comers of the cube. The 'B' atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is

(A) AB

(B) AB3

(D) A3B

Answer:: (B)

111. A covalent molecule AB3 has pyramidal structure. The number of lone pair and bond pair electrons in the molecule are respectively

(A) 3 and 1

(B) 1 and 3

(D) 0 and 4

Answer:: (B)

112. A diabetic person carries a pocket of Glucose with him always, because

(A) Glucose reduces the blood sugar level.

(B) Glucose increases the blood sugar level almost instantaneously.

(D) Glucose increases the blood sugar level slowly.

Answer:: (B)

113. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.

(A) 2, 2 - dibromobutane

(B) 1, 1 - dibromopropane

(D) 1, 2 - dibromoethane

Answer:: (C)

A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note : h = 6.63 ´ 10-34Js)

100. A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note : h = 6.63 ´ 10-34Js)

(A) 6.63 ´ 10-37m

(B) 6.63 ´ 10-31m

(D) 6.63 ´ 10-35m

Answer:: (B)

101. A body of mass x kg is moving with a velocity of 100 ms-1. Its de Broglie wavelength is 6.62 ´ 10-35m. Hence x is (h = 6.62 ´ 10-34Js)

(A) 0.15 kg

(B) 0.2 kg

(D) 0.25 kg

Answer:: (C)

102. A buffer solution contains 0.1 mole of sodium acetate dissolved in 1000 cm3 of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is equal to ______.

(A) pKa

(B) pKa - Log2

(D) pKa + 2

Answer:: (C)

103. A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 × 10–5, what is the pH of this solution?

(A) 8.73

(B) 9.08

(D) 11.72

Answer:: (C)

104. A complex compound in which the oxidation number of a metal is zero is

(A) K4 [Fe (CN)6]

(B) K3 [Fe (CN)6]

(D) [Pl (NH3 )4]Cl2

Answer:: (C)

105. Which of the following is not an ore of magnesium?

(A) Carnallite

(B) Dolomite

(D) Sea water

Answer:: (C)

106. Which of the following has the highest bond order?

(A) N2

(B) O2

(D) H2

Answer:: (A)