Chemistry, 29.10.2019 02:31 AysiaRamosLee

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.

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Answer from: kcutler8603

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) $P_4(s)+10HClO(aq)+6H_2O(l)\rightarrow 4H_3PO_4(aq)+10HCl(aq)$

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) $Br_2(l)+2K(s)\rightarrow 2KBr(s)$

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) $CH_3CH_2OH(l)+3O_2(g)\rightarrow 3H_2O(l)+2CO_2(g)$

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) $ZnCl_2(aq)+2NaOH(aq)\rightarrow Zn(OH)_2(s)+2NaCl(aq)$

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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Answer from: Quest

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Which of the following are redox reactions?
p4(s)+10hclo(aq)+6h2o(l)? 4h3po4(aq)+10hcl(aq)

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