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  • (a) Account for the following : (i) is coloured whereas

(a) Account for the following :

(i) Ti^{3+} is coloured whereas Sc^{3+} is colourless in aqueous solution.

(ii) Cr^{2+} is a strong reducing agent.

(b) Write two similarities between chemistry of lanthanoids and actinoids.

(c) Complete the following ionic equation :
        3MnO^{2-}_{4}+4H^{+}\rightarrow

 

 
 
 
 
 

Answers (1)

a)

i) Ti3+ has an unpaired electron while there are no unpaired electrons in Sc3+

ii) Because of Stable t2g3 of Cr3+ ion

b)

1. Both show variable oxidation states

2. Both show f-f transitions

c) 3MnO4 2– + 4H+ → 2MnO4 – + MnO2 + 2H2O

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Safeer PP

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