Chemistry, 30.07.2019 06:10 LindaCat78

Which equation describes a reduction?
mg(s)—mg2+ (aq) + 2e -
201 + 2e -> 201
na(s) — nat(aq) + e
al(s)— a3+ (aq) + 3e -

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Answer from: granniejo

1,3,4 equations represent oxidation as charge increases

Your 2 nd option represents reduction

Answer from: mariagoldgames

Answer : The reduction will be $X_2+2e^-\rightarrow 2X^-$

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given half reactions is:

$Mg(s)\rightarrow Mg^{2+}(aq)+2e^-$

This reaction is an oxidation reaction because in this reaction, the loss of electrons takes place.

(b) The given half reactions is:

$X_2+2e^-\rightarrow 2X^-$

This reaction is an reduction reaction because in this reaction, the gain of electrons takes place.

$Na(s)\rightarrow Na^{+}(aq)+e^-$

This reaction is an oxidation reaction because in this reaction, the loss of electrons takes place.

(d) The given half reactions is:

$Al(s)\rightarrow Al^{3+}(aq)+3e^-$

This reaction is an oxidation reaction because in this reaction, the loss of electrons takes place.

Hence, the reduction will be $X_2+2e^-\rightarrow 2X^-$

Answer from: Quest

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

Answer from: Quest

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.

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Which equation describes a reduction?
mg(s)—mg2+ (aq) + 2e -
201 + 2e -> 201
n...

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