Question

In: Chemistry

Indicate the oxidation number of each element in the following species. Click in the answer box...

Indicate the oxidation number of each element in the following species. Click in the answer box to open the symbol palette.

(a) Cr(s)

(b) Br2(l)

(c) Cr3+(aq)

(d) Br-(aq)

Expert Solution

Oxidation number denotes oxidation state of an elelment in a compound.

Cr (s) : Oxidation number of Cr is 0.

Rule : In elements, in the free or the uncombined state, each atom have an oxidation number zero.

Accoridng to this rule , oxidation number of Cr in Cr (s) will be zero.

Br2(l) : Oxidation number of Br is 0.

Rule : In elements, in the free or the uncombined state, each atom have an oxidation number zero.

Accoridng to this rule , oxidation number of Br in Br2(l) will be zero.

Cr 3+ (aq) : Oxidation number of Cr in Cr 3+ (aq) is +3.

Rule : in case of ions, composed of only one atom, the oxidation number is equal to charge on the ion.

In this case, Cr 3+ ion is composed of only one Cr atom , therefore oxidation number of Cr is equal to charge on ion i e +3.

Br - (aq) : Oxidation number of Br is - 1

Rule : in case of ions, composed of only one atom, the oxidation number is equal to charge on the ion.

In this case, Br - ion is composed of only one Br atom , therefore oxidation number of Br is equal to charge on ion i e - 1.

Species	Oxidation number
Cr (s)	0
Br2(l)	0
Cr 3+ (aq)	+ 3
Br - (aq)	- 1

queen_honey_blossom answered 1 year ago

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