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GaryCarmine
18.03.2020 •
Chemistry
Indicate whether the following balanced equations involve oxidation-reduction. Check all that apply. Check all that apply. 2H2SO4(aq) 2NaBr(s)→Br2(l) SO2(g) Na2SO4(aq) 2H2O(l) 3SO2(g) 2HNO3(aq) 2H2O(l)→3H2SO4(aq) 2NO(g) NaI(aq) 3HOCl(aq)→NaIO3(aq) 3HCl(aq) PBr3(l) 3H2O(l)→H3PO3(aq) 3HBr(aq)
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Ответ:
Answer : The balanced equations involve oxidation-reduction are:
(a)![2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)](/tpl/images/0552/1869/f38bd.png)
(b)![3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)](/tpl/images/0552/1869/ecc66.png)
(c)![NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)](/tpl/images/0552/1869/f5361.png)
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 chemical reaction is:
This reaction involve oxidation-reduction reaction because the oxidation state bromine changes from (-1) to (0) which shows oxidation and sulfur changes from (+6) to (+4) which shows reduction.
(b) The given chemical reaction is:
This reaction involve oxidation-reduction reaction because the oxidation state sulfur changes from (+4) to (+6) which shows oxidation and nitrogen changes from (+5) to (+2) which shows reduction.
(c) The given chemical reaction is:
This reaction involve oxidation-reduction reaction because the oxidation state iodine changes from (-1) to (+5) which shows oxidation and chlorine changes from (+5) to (-1) which shows reduction.
(d) The given chemical reaction is:
This reaction does not involve oxidation-reduction reaction because the oxidation state of element present on reactant and product side are same.
Ответ:
True
Explanation:
It is true as metals form a positive ion when they take part in a chemical reaction. Nonmetals form an anion when bonding.
:)