Answer
Verified
398.1k+ views
Hint: We know that there are two chromium atoms and seven oxygen atoms are present in dichromate anion and the each chromium atom is linked to three oxygen atoms and there is a bridge between the chromium atom and the one oxygen atom.
Complete step by step answer:
Now we see the structure of dichromate ion,
There are eight chromium- oxygen bonds. Among the eight bonds six equivalent chromium- oxygen bonds at terminal.
We know that the Partial double bonds are caused by resonance during a structure, which is the transfer of pi electrons from one site to another. They are said to be partial because the structure can resonate, or flip, between two or more conformations. Of those conformations, a minimum of one will feature a covalent bond between the 2 atoms of interest and a minimum of one will feature one bond.
All the six bonds at terminal end are equivalent due to resonance and these are the oxoanions of chromium and the oxidation state of chromium is $ + 6$.
Therefore, the option C is correct.
Additional Information:
We must know that dichromate anion is a divalent inorganic ion and it is the conjugate base of hydrogen dichromate. Dichromate ion is formed by removing protons from dichromic acid. The molecular formula for dichromic acid is ${H_2}C{r_2}{O_7}$. Dichromate ion is used as an oxidizing agent and it gives many salts because of its ionic property. Both the chromium atoms in dichromate ion present at the center of the tetrahedral bond to four oxygen atoms.
Note:
We can define oxidation state as the degree of loss of an electron in a chemical compound. Now we can calculate the oxidation state of chromium as follows,
Let us take X as the oxidation number of chromium.
The oxidation number of chromium in$\left( {C{r_2}{O_7}^{2 - }} \right)$,
$2X + 7\left( { - 2} \right) = - 2$
$ \Rightarrow 2X - 14 = - 2$
$ \Rightarrow 2X = - 2 + 14$
$ \Rightarrow 2X = + 12$
$ \Rightarrow X = \dfrac{{ + 12}}{2}$
On simplifying we get,
$X = + 6$.
Complete step by step answer:
Now we see the structure of dichromate ion,
There are eight chromium- oxygen bonds. Among the eight bonds six equivalent chromium- oxygen bonds at terminal.
We know that the Partial double bonds are caused by resonance during a structure, which is the transfer of pi electrons from one site to another. They are said to be partial because the structure can resonate, or flip, between two or more conformations. Of those conformations, a minimum of one will feature a covalent bond between the 2 atoms of interest and a minimum of one will feature one bond.
All the six bonds at terminal end are equivalent due to resonance and these are the oxoanions of chromium and the oxidation state of chromium is $ + 6$.
Therefore, the option C is correct.
Additional Information:
We must know that dichromate anion is a divalent inorganic ion and it is the conjugate base of hydrogen dichromate. Dichromate ion is formed by removing protons from dichromic acid. The molecular formula for dichromic acid is ${H_2}C{r_2}{O_7}$. Dichromate ion is used as an oxidizing agent and it gives many salts because of its ionic property. Both the chromium atoms in dichromate ion present at the center of the tetrahedral bond to four oxygen atoms.
Note:
We can define oxidation state as the degree of loss of an electron in a chemical compound. Now we can calculate the oxidation state of chromium as follows,
Let us take X as the oxidation number of chromium.
The oxidation number of chromium in$\left( {C{r_2}{O_7}^{2 - }} \right)$,
$2X + 7\left( { - 2} \right) = - 2$
$ \Rightarrow 2X - 14 = - 2$
$ \Rightarrow 2X = - 2 + 14$
$ \Rightarrow 2X = + 12$
$ \Rightarrow X = \dfrac{{ + 12}}{2}$
On simplifying we get,
$X = + 6$.
Recently Updated Pages
Which of the following is the correct formula of Gypsum class 10 chemistry CBSE
Biogas is a mixture of A Methane + CO 2 B Methane + class 10 chemistry CBSE
Graphite is a good conductor of electricity due to class 10 chemistry CBSE
What is the number of valence electrons in the Clion class 10 chemistry CBSE
Which oxidation state for nitrogen is correctly given class 10 chemistry CBSE
Why do we store silver chloride in dark colored bo class 10 chemistry CBSE
Trending doubts
Difference Between Plant Cell and Animal Cell
Give 10 examples for herbs , shrubs , climbers , creepers
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Name 10 Living and Non living things class 9 biology CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Fill the blanks with proper collective nouns 1 A of class 10 english CBSE
Select the word that is correctly spelled a Twelveth class 10 english CBSE
Write the 6 fundamental rights of India and explain in detail