1.

(a) Complete the following chemical equation: (i) Cr_(2)O_(7)^(2-)(aq)+H_(2)S(g)+H^(+)(aq) to , (ii) Cu^(2+)(aq)+I^(-)(aq) to (b) How would you account for the following: (i)Theoxidising power of oxoanion are in the orderVO_(2)^(+)ltCr_(2)O_(7)^(2-)ltMnO_(4)^(-). (ii) The third ionization enthalpy of manganese (Z=25) is exceptionally high. (iii) Cr^(2+) is a stronger reducing agent than Fe^(2+). Or (a) Complete the following chemical equation: (i) MnO_(4)^(-)(aq)+s_(2)O_(3)^(2-)(aq)+H_(2)O(I) to (ii) Cr_(2)O_(7)^(2-)(aq)+Fe^(2+)(aq)+H^(+)(aq) to (b) Explain the following observation: (i) La^(3+)(Z=57) and Lu^(3+)(Z=71) donot show any colour in solutions. (ii) Among the divalent cation in the first series of transition elements, manganese exhibits the maximum paramagnetism. (iii) Cu^(+) ion is not known in aqueous solutions.

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SOLUTION :N//A


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