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______ is another allotrope of oxygen.

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To overcome Ea and to perform a reaction, the following strategy is not the feasible ()

A. Heating reactant
B. Igniting reactant
C. Using catalyst
D. Increasing concentration of reactant

Choose the right name of 盐酸 and 硫酸 ()

A. Hydrochloric acid and hydrogen sulfate
B. Hydrogen chloride and hydrogen sulfate
C. Hydrochloric acid and sulfuric acid
D. Hydrogen chloride and sulfuric acid

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Choose the right name of 乙烷 and 丁炔 ()

A. Ethane and butyne
B. Ethane and butayne
C. Ethene and butyne
D. Ethane and butane

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Choose the right description ()

A. The positions in ionic crystals are occupied by molecules.
B. The carbonyl double bond is polar bond.
C. The oxidation number of an atom of any free element is zero.
D. Nitrogen gas is used in lighter than air balloons.

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