Explanation
Hint: In the oxides, the oxidation number of oxygen is -2
Correct Answer: Option A
Explanation:
Let the oxidation number of the central atom be x
CrO^{-}_{2}:
\therefore x=+3
CrO_{4}^{2-}:
\therefore x=+6
ClO^{-}_{3} :
\therefore x = +5
MnO_{4}^{-}:
\therefore x = +7
Hence, correct answer is CrO^{-}_{2}, ClO^{-}_{3} , CrO_{4}^{2-}, MnO_{4}^{-}
Hint
The total number of electrons that an atom acquires or loses in order to form a chemical connection with another atom is known as the oxidation number.
Let the central oxidation number is x.
The oxidation number of O is 2.
Step 1: the oxidation state of CrO_{2}^{-}
Thus, the oxidation state if Cr in CrO_{2}^{-}.
x+2\times \left( -2 \right)=-1
x-4=-1
x=-1+4
x=3
Step 2 : the oxidation state of CrO_{4}^{2-},
x+4\times \left( -2 \right)=-2
x-8=-2
x=8-2
x=6
Step 3 : the oxidation state of ClO_{3}^{-},
x+3\times \left( -2 \right)=-1
x-6=-1
x=6-1=5
Step 4: the oxidation state of MnO_{4}^{-},
x+4\times \left( -2 \right)=-1
x-8=-1
x=8-1=+7
Hence, the increasing order of the central atom is CrO_{2}^{-}<ClO_{3}^{-}<CrO_{4}^{2-}<MnO_{4}^{-}.
Final answer
The correct answer is option (A).
In Ni{(CO) }_{ 4 } the oxidation state of Ni is:
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