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The oxoanion which contains all equivale...

The oxoanion which contains all equivalent M-O bond is
`I) CrO_(4)^(2-)" "II)MnO_(4)^(2-)" "III)Cr_(2)O_(7)^(2-)`

A

III only

B

I,II,III

C

I,II

D

I only

Text Solution

Verified by Experts

The correct Answer is:
C

due to resonance all `M-O` bonds are equivalent.
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The oxoanion which contains all equivalent M-O bond is I) CrO_(4)^(2-)" "II)MnO_(4)^(-)" "III)Cr_(2)O_(7)^(2-)

K_(2)Cr_(2)O_(7)+NaoH to CrO_(4)^(2-)

Three different solutions of oxidising agents KMnO_(4),K_(2)Cr_(2)O_(7) " and "I_(2) is titrated separately with 0.158 gm of Na_(2)S_(2)O_(3) . If molarity of each oxidising agent is 0.1 M and reactions are : I. MnO_(4)^(-)+S_(2)O_(3)^(2-) toMnO_(2)+SO_(4)^(2-) II CrO_(7)^(2-)+S_(2)O_(3)^(2-) to Cr^(3+)+SO_(4)^(2-) III. I_(2)+S_(2)O_(3)^(2-) to S_(4)O_(6)^(2-)+I^(-)

Following ions are equilibrium at Cr_(2) O_(7)^(2-) hArr CrO_(4)^(2-)

Complete the following chemical equations : (i) 8MnO_(4)^(-)+3S_(2)O_(3)^(2-)+H_(2)O to (ii) Cr_(2)O_(7)^(2-)+3Sn^(2+)+14H^(+) to

(b ) Draw the structures of Cr_(2) O_(7)^(2-) , CrO_(4)^(-2) MnO_(4)^(-)