Redox Reactions (OCR A-Level Chemistry A): Quizzes

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Redox Reactions
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What does the 'O' in OILRIG stand for?

Oxidation Is Loss

What is reduction in terms of electron transfer?

Gain of electrons

What is the oxidation number of sulfur in uncombined S\text{S}?

0

What is the usual oxidation number of combined oxygen?

-2

What happens to an oxidising agent during a redox reaction?

It is reduced

In 2Ag++Cu→Cu2++2Ag2\text{Ag}^+ + \text{Cu} \rightarrow \text{Cu}^{2+} + 2\text{Ag}, which is the reducing agent?

Cu\text{Cu}

When combining half-equations, what must be equal?

Electrons lost and gained

What must be equal when using oxidation numbers to balance redox equations?

Total increase and decrease in ox. number

In a reduction half-equation, where are electrons placed?

On the left (reactant side)

Which species is commonly formed in aqueous redox reactions?

H2O\text{H}_2\text{O}

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