Can double replacement reactions be redox reactions?

Answer 1

No, they cannot.

In double replacement reactions, elements do not change oxidation states, which is a requirement for a reaction to be classified as redox.

E.g #AgNO_3+NaCl -> AgCl + NaNO_3#

Ag and Na are both +1 before and after the reaction, while NO3 and Cl are both -1 before and after the reaction.

It is not a redox reaction as a result.

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Answer 2

Olivia Anton

Indeed, if there is an electron transfer between the reactants that alters the oxidation states of the constituent elements, then double replacement reactions can be classified as redox reactions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.