Respuesta :
Answer:
The oxidation reduction reaction which is also a synthesis reaction is:
A.[tex]2Mg(s)+O_{2}(g)\rightarrow 2MgO(s)[/tex].
Explanation:
A Synthesis reaction is a reaction in which two or more reactants combine to form a single product.
A redox reaction(oxidation reduction) is a reaction in which one species is oxidised and one is reduced simultaneously.
Oxidation: Loss of electron or increase in oxidation state
Reduction: Gain of electron or decrease in oxidation state
In both cases A,B two reactant are combining to give a single compound.So both are synthesis reaction.
A.[tex]2Mg(s)+O_{2}(g)\rightarrow 2MgO(s)[/tex] is a redox reaction :
Oxidation of Mg :[tex]2Mg(s)\rightarrow 2Mg^{2+}+4e^{-}[/tex]
(increase in oxidation state of Mg from 0 to +2)
Reduction of Oxygen: [tex]O_{2}(g)+4e^{-}\rightarrow 2O^{2-}[/tex]
(decrease in oxidation state of O from 0 to -2)
on combining above half-reactions:
[tex]2Mg(s)+O_{2}(g)\rightarrow 2MgO(s)[/tex]
Its both redox and synthesis reaction.
But there is no change in oxidation states of elements in Reaction B
[tex]Pb^{2+}(aq)+CrO_{4}^{2-}\rightarrow PbCrO_{4}(s)[/tex]
oxidation state of Pb is (+2) in both [tex]Pb^{2+}[/tex]and [tex]PbCrO_{4}[/tex]:
[tex]Pb^{2+}\rightarrow PbCrO_{4}[/tex]
Cr has (+6) oxidation state in both [tex]CrO_{4}{2-}[/tex] and [tex]PbCrO_{4}[/tex]:
[tex]CrO_{4}{2-}\rightarrow PbCrO_{4}[/tex]
No change in oxidation state so no loss/gain of electrons .Hence not a redox reaction
B. is not a oxidation reduction reaction ,its just a synthesis reaction.
Hence,
The oxidation reduction reaction which is also a synthesis reaction is:
A.[tex]2Mg(s)+O_{2}(g)\rightarrow 2MgO(s)[/tex].
[tex]\rm 2\;Mg\;(s)\;+\;O_2\;(g)\;\rightarrow\;2\;MgO\;(s)[/tex], this is the redox reaction and also a synthesis reaction.
A redox reaction is that where reduction and oxidation take simultaneously.
The synthesis reaction is one in which the product is formed.
(A) The reaction of Mg with [tex]\rm O_2[/tex] will form MgO.
Since there is the formation of the product by reaction of 2 reagents, it is a synthesis reaction.
In this reaction, Mg is getting oxidized and oxygen is getting reduced.
So this is a redox reaction as well.
(B) The reaction of Pb with chromate will result in [tex]\rm PbCrO_4[/tex].
There is a formation of product in the reaction, so it is a synthesis reaction.
There is no change in the oxidation state of lead, so it is not a redox reaction.
For more information about oxidation-reduction reaction, refer the link:
https://brainly.com/question/13978139?referrer=searchResults
