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Which statements about the allotropes of carbon are correct? I. Graphite conducts electricity because each carbon atom contributes one electron to a delocalized system. II. Diamond conducts electricity because it has a covalent network structure. III.…
Which species contain a coordination bond? I. II. III. A. I and II only B. I and III only C. II and III only D. I, II and III
What is the hybridization of the atoms labelled I, II and III in the molecule shown? A. I: , II: , III: B. I: , II: , III: C. I: , II: , III:…
Which Lewis formula of the sulfate ion, , is preferred on the basis of formal charges? A. Formula A B. Formula B C. Formula C D. Formula D
A solid has a very high melting point, does not conduct electricity when solid or when molten, and is insoluble in water and in non-polar solvents. Which type of structure does the solid have? A. Ionic lattice B. Metallic lattice C. Covalent molecular D.…
Which statement best explains why aluminium can be drawn into thin wires? A. The delocalized electrons carry charge through the metal. B. The layers of aluminium ions can slide over each other while the delocalized electrons keep the lattice bonded. C.…
What are the numbers of σ (sigma) and π (pi) bonds in one molecule of prop-2-ynal, ? A. 5 σ and 3 π B. 3 σ and 3 π C. 3 σ and 5 π D. 6 σ and 2 π
Which substance is a good conductor of electricity in the solid state? A. Graphene B. Diamond C. Silicon dioxide D. Silicon
Which of these elements is a non-metal found in the p-block of the periodic table? A. Bi B. Se C. Sc D. Cs
What is the IUPAC name of the compound shown? A. 3-methylhexan-4-one B. 4-methylhexan-3-one C. 4-ethylpentan-3-one D. 2-ethylpentan-3-one