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This quiz contains 10 questions from a mix of 1 subtopics.

Oxidation numbers are numbers given to each atom or ion in a compound that show its degree of...

reduction

ionisation

oxidation

electronegativity

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Which of the following statements is true about oxidation numbers?

the oxidation number of an element in a monatomic ion is always zero

the sum of the oxidation numbers in a compound is always zero

more positive oxidation numbers mean atoms or ions are more reduced

more negative oxidation numbers mean atoms or ions are more oxidised

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In which of the following compounds is the oxidation number of sulfur +4?

sulfur hexafluoride (SF6)

sulfuric acid (H2SO4)

sulfur trioxide (SO3)

sulfur dioxide (SO2)

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What is the oxidation number of chlorine in the perchlorate ion (ClO4-)?

-1

+1

+4

+7

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The oxidation number of hydrogen in metal hydrides such as NaH is .

-1

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The oxidation number of oxygen in peroxides such as H2O2 is .

-1

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In compounds of a non-metal with a non-metal, the more element is given the negative oxidation number.

electronegative

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What is the oxidation number of oxyen in the compound OF2?

+1

+2

-1

-2

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What is the sum of the oxidation numbers in a compound?

zero

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What is the oxidation number of phosphorus in phosphoric acid, H3PO4?

+5

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