题目内容

Choose the negative oxidation number ()

An element has lost electrons
B. An element is sharing electron with a less electronegative element
C. Free element
D. Cation

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Choose the right characterizations of benzene () ①aliphatic ②C to C bond distances were identical ③aromatic ④delocalized unhybridized p orbital

A. ③④
B. ①②③
C. ①③
D. ②③④

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Choose the right description ()

An element which obtains an electron possesses positive charge.
B. Silicon might take the place of carbon in forming long chains compounds.
C. Hydrogen is the lightest element.
D. Ozone is a typical nontoxic gas.

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Which reaction can be used to produce electricity ()

A. Double displacement reactions
B. Displacement reactions
C. Redox reactions
D. Combination reactions

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Choose the right characterizations of oxygen () ①colourless ②odourless ③tasteless ④Liquid and solid oxygen are pale blue

A. ①②③④
B. ①④
C. ②③④
D. ①③

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Choose the negative oxidation number ()

An element has lost electrons B. An element is sharing electron with a less electronegative element C. Free element D. Cation

Choose the right characterizations of benzene () ①aliphatic ②C to C bond distances were identical ③aromatic ④delocalized unhybridized p orbital

Choose the right description ()

Which reaction can be used to produce electricity ()

Choose the right characterizations of oxygen () ①colourless ②odourless ③tasteless ④Liquid and solid oxygen are pale blue

An element has lost electrons
B. An element is sharing electron with a less electronegative element
C. Free element
D. Cation