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. All Group 14 elements, except ______________, have at least one solid phase with diamond-like structure.

Pb correct incorrect

Sn correct incorrect

Ge correct incorrect

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. Partially crystalline forms of carbon include:

diamonds correct incorrect

carbon clusters correct incorrect

activated carbon correct incorrect

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. Compared to hydrocarbons, silanes are:

more reactive correct incorrect

less reactive correct incorrect

just as reactive correct incorrect

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. The thermal stability of germane (GeH₄), stanane (SnH₄), and plumbane (PbH₄) decreases in the following order:

There is no appreciable difference in the thermal stability of germane, stanane, and plumbane. correct incorrect

GeH₄ > SnH₄ > PbH₄ correct incorrect

PbH₄ > SnH₄ > GeH₄ correct incorrect

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. Which statement is incorrect?

CO is a strong reducing agent. correct incorrect

CO is an excellent ligand toward metals in low oxidation states. correct incorrect

CO reacts with OH^– to form HCOO^–. correct incorrect

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. The anion [Si₃O₉]^n– has a ___________ structure and a charge of ____________:

three-atomic ring; –3 correct incorrect

six-atomic ring; –6 correct incorrect

nine-atomic ring; –9 correct incorrect

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. The cyanide ion, CN^–, is:

isoelectronic with the CO₂ molecule. correct incorrect

a weak Brønsted base correct incorrect

highly poisonous correct incorrect

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. Molecular sieves are:

crystalline alumosilicates that have open structures with apertures of molecular sizes correct incorrect

soccer-ball-shaped cluster compounds consisting of carbon atoms correct incorrect

concentric cylindrical tubes formed of sheets containing hexagonal arrangements of carbon atoms correct incorrect

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. Silicon polymers can be synthesized in liquid, gel, or resin forms, which, just like their properties, depend on:

the length of the polymeric chain correct incorrect

the degree of polymerization and cross-linking of the polymer chains correct incorrect

the degree of branching of the polymer chains correct incorrect

* not completed

. Unlike organosilicon and organogermanium compounds, the organotin compounds are characterized by:

greater occurrence of the +2 oxidation state, greater range of coordination numbers, and the presence of halide bridges correct incorrect

greater occurrence of the +4 oxidation state, greater range of coordination numbers, and the presence of halide bridges correct incorrect

greater occurrence of the +4 oxidation state, lower range of coordination numbers, and the presence of halide bridges correct incorrect