chemistry MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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
161. Metallic crystals are soluble in________________?
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A. Non polar solvent

B. None

C. Polar solvent

D. Fused metal
162. According to vital force theory_______________?
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A. organic compounds can be synthesized by animals

B. organic compounds cannot be synthesized from inorganic compounds

C. Oorganic compounds can be synthesized from inorganic compounds

D. organic compounds can be synthesized by plants

163. Water absorber used in combustion analysis is___________________?
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A. Lime water

B. CaCl2

C. 50% KOH

D. Mg (CIO4)2
164. 18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?
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A. 6

B. one/fifty one

C. 5.1

D. 8

165. Which of the following statements is wrong about isotopes ?
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A. they possess different mass number

B. they possess different physical properties

C. they possess same chemical properties

D. they possess different position in the periodic table
166. Organic compounds are soluble in ____________________?
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A. non-polar solvent

B. alkalies

C. water

D. polar solvent

167. The mass of decimole of electrons (NA) is___________________?
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A. 0.184 mg

B. 1.008 mg

C. 5.4 mg

D. 0.054 mg
168. Which is true about Zn-Cu galvanic cell ?
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A. Reduction occurs at anode

B. K+ ion transfer from salt bridge to left beaker of ZnSO4

C. Anode is negatively charged

D. Oxidation occurs at cathode

169. The soul of chemistry is dealing with___________?
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A. Composition and properties of matter

B. Internal structural changes in matter

C. Properties of matter

D. Composition of matter

170. Which one of the following is not the mono isotopic element ?
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A. arsenic

B. nickel

C. uranium

D. iodine

171. Which of the following is a substance?
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A. Graphite

B. Tape water

C. Brass

D. Sand

E. Sea water

172. Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?
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A. 4

B. 10

C. 6

D. 8

173. Octane number 2 2 4-trimethyl pentane is__________________?
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A. 100

B. 80

C. 90

D. 70

174. When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________?
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A. Carboxylic acid

B. Propanoic acid

C. Butanoic acid

D. Ethanoic acid

175. Which of the following is not characteristics of reversible reaction__________________?
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A. a catalyst changes the direction of reaction

B. chemical equilibrium is established

C. whole amount of reactant does not change into product

D. rate of forward reaction decreases as reaction proceeds

176. Only sigma bonds are present in__________________?
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A. butanal

B. propene

C. ethoxy ethane

D. butanoic acid

177. Diameter of an atom is in the order of________________?
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A. 0.2nm

B. 0.2m

C. 0.2mm

D. 0.2pm

178. Paramagnetic behaviour of substance is measured by a balance called___________________?
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A. Electrical balance

B. Single beam balance

C. Analytical balance

D. Guoys balance
179. The unit of molality is__________________?
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A. moles kg-1

B. none

C. gram dm-3

D. moles dm-3

180. The number of peaks obtained in mass spectrometry shows____________________?
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A. Average mass of element

B. Relative isotopic mass

C. Relative abundance

D. Number of isotopes