Which of the following are redox reactions?
p4(s)+10hclo(aq)+6h2o(l)? 4h3po4(aq)+10hcl(aq)
br2(l)+2k(s)? 2kbr(s)
ch3ch2oh(l)+3o2(g)? 3h2o(l)+2co2(g)
zncl2(aq)+2naoh(aq)? zn(oh)2(s)+2nacl(aq)
check all that apply.
part bfor those reactions that are redox, indicate which elements are oxidized. express your answers as chemical symbols separated by a commas. part cfor those reactions that are redox, indicate which elements are reduced. express your answers as chemical symbols separated by a commas. part dfor those reactions that are not redox, indicate whether they are precipitation or neutralization reactions.

Answer :

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.

Precipitation reaction : It is defined as the reaction in which an insoluble salt formed when two aqueous solutions are combined.

The insoluble salt that settle down in the solution is known an precipitate.

(1)

This reaction is a redox reaction.

In this reaction, the oxidation state of 'P' changes from (0) to (+5) that means 'P' lost 1 electron and it shows oxidation reaction and the oxidation state of 'Cl' changes from (+1) to (-1) that means 'Cl' gain 1 electron and it shows reduction reaction.

'P' is oxidized and 'Cl' is reduced.

(2)

This reaction is a redox reaction.

In this reaction, the oxidation state of 'K' changes from (0) to (+1) that means 'K' lost 1 electron and it shows oxidation reaction and the oxidation state of 'Br' changes from (0) to (-1) that means 'Br' gain 1 electron and it shows reduction reaction.

'K' is oxidized and 'Br' is reduced.

(3)

This reaction is a redox reaction.

In this reaction, the oxidation state of 'C' changes from (-1) to (+4) that means 'C' lost 1 electron and it shows oxidation reaction and the oxidation state of 'O' changes from (0) to (-2) that means 'O' gain 2 electrons and it shows reduction reaction.

'C' is oxidized and 'O' is reduced.

(4)

This reaction is a precipitation reaction in which the two aqueous solution zinc chloride and sodium hydroxide combined to give sodium chloride solution and zinc hydroxide as a precipitate. In precipitation reaction there is no changes in oxidation state of the element.

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