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401.

For the redox reaction `MnO_(4)^(ө)+C_(2)O_(4)^(2-)+H^(o+)rarrMn^(2+)+CO_(2)+H_(2)O` the correct coefficients of the reactions for the balanced reaction areA. `{:(MnO_(4)^(-),C_(2)O_(4)^(2-),H^(+)),(16,5,2):}`B. `{:(MnO_(4)^(-),C_(2)O_(4)^(2-), H^(+)),(2,5,16):}`C. `{:(MnO_(4)^(-),C_(2)O_(4)^(2-),H^(+)),(2,16,5):}`D. `{:(MnO_(4)^(-),C_(2)O_(4)^(2-),H^(+)),(5,16,2):}`

Answer» Correct Answer - B
`MnO_(4)^(-) +5e^(-) rarr Mn^(2+)` ...(1)
`underset(O)underset(||)underset(" C"-O^(-))underset(|)overset(O)overset(||)(" C"-O^(-))rarr 2CO_(2) +2e^(-)`
multiplying (1) by 2 and (2) by 5 yo balance `e^(-)`
`2MnO_(4)^(-) +5C_(2)O_(4)^(-2) rarr 2Mn^(+2) +10 CO_(2)`
Only suitable choice is (b).
Discussion
402.

Which have maximum paramagnetism in `M^(3+)` ion for Lanthanoid (spin only ) ?

Answer» Gd due to 7 unpaired electron
Discussion
403.

Name the gas that can readily decolourise acidified `KMnO_(4)` solution:A. `SO_(2)`B. `NO_(2)`C. `P_(2) O_(5)`D. `CO_(2)`

Answer» Correct Answer - A
`SO_(2)` is readily decolourises acidified `KMnO_(4)`
`2Kunderset((O.A))overset(+7)(MnO_(4)) + 5underset((R.A))overset(+4)(SO_(2)) + 2H_(2)O rarr underset("Colourless")(2MnSO_(4)) + 2H_(2)SO_(4) + K_(2)SO_(4)`
Discussion
404.

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified `KMnO_(4)` for complete oxidation ?A. `FeC_(2) O_(4)`B. `Fe (NO_(2))_(2)`C. `FeSO_(4)` is oxidised `KMnO_(4)` and is reducedD. `FeSO_(3)`

Answer» Correct Answer - C
`FeSO_(4)`
Discussion