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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...

electronegativity

reduction

oxidation

ionisation

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Which of the following statements is true about oxidation numbers?

more negative oxidation numbers mean atoms or ions are more oxidised

more positive oxidation numbers mean atoms or ions are more reduced

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

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

sulfur hexafluoride (SF6)

sulfuric acid (H2SO4)

sulfur dioxide (SO2)

sulfur trioxide (SO3)

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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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