Select the correct answer. Did an oxidation-reduction reaction occur in the reaction between copper sulfate and sodium sulfide?

CuSO4 + Na2S → CuS + Na2SO4

A.
This is a redox reaction because copper gained electrons.
B.
This is a redox reaction because sodium lost electrons.
C.
This is a redox reaction because sulfur gained electrons.
D.
This is not a redox reaction because no electrons were transferred.
E.
This is not a redox reaction because oxygen did not gain electrons.

D. This is not a redox reaction because no electrons were transferred.

Explanation:

We can check whether a reaction is a redox reaction by determining the oxidation number of each atom on both sides of the arrow.

The oxidation number does not change for any atom, so this is not a redox reaction.

Precipitation question

B. CdSO₄(aq) + K₂S(aq) → CdS(s) + K₂SO₄(aq)

Explanation:

A precipitation reaction occurs when an insoluble solid forms from the reaction of two substances in a solution.

This is the only reaction that forms a solid from two soluble reactants.

Explanation:

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yes they ca   is ur ansswerrr

the ratio of the conjugate base to the acid required to attain the desired ph.