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La^(3+)(Z=57) and Lu^(3+)(Z=71) do not s...

`La^(3+)(Z=57)` and `Lu^(3+)(Z=71)` do not show any colour in solution. Assign reason.

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Explain the following observation : La^(3+) (Z =57) and Lu^(3+) (Z = 71) do not show any colour in solutions.

Explain the following observation : La^(3+) (Z =57) and Lu^(3+) (Z = 71) do not show any colour in solutions.

(a) Complete the following chemical equations : (i) MnO_(4)^(-) (aq) + S_(2)O_(3)^(2-) (aq) + H_(2)O(l) to (ii) Cr_(2)O_(7)^(2-)(aq)+Fe^(2+) (aq) + H^(+) (aq) to (b) Explain the following observatons : (i) La^(3+) (Z = 57) and Lu^(3+) (Z = 71) do not show any colour in solutions. (ii) Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism. (iii) Cu^(+) ion is not known in aqueous solutions.

(a) Complete the following chemical equations : (i) MnO_(4)^(-) (aq) + S_(2)O_(3)^(2-) (aq) + H_(2)O(l) to (ii) Cr_(2)O_(7)^(2-)(aq)+Fe^(2+) (aq) + H^(+) (aq) to (b) Explain the following observatons : (i) La^(3+) (Z = 57) and Lu^(3+) (Z = 71) do not show any colour in solutions. (ii) Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism. (iii) Cu^(+) ion is not known in aqueous solutions.

La^(3+) and Lu^(3+) are

Both La^(3+) and Lu^(3+) are diamagnetic .