(a) Following are the transition metal ions of 3d series :
Ti4+, V2+,Mn3+, Cr3+
(Automic numbers :Ti = 22, V = 23,Mn = 25, Cr = 24 )
Answer the following :
(i) Which ion is most stable in an aqueous solution and why ?
(ii) Which ion is a strong oxidising agent and why ?
(iii) Which ion is colourless and why ?
(b) Complete the following equations :
(i) 2MnO^{-}_{4}+16H^{+}+5S^{2-}\rightarrow
(ii) KMnO_{4}\overset{heat}{\rightarrow}

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) (i) Cr3+ is most stable in aqeous solution. according to crystal field Theory it has t2g3 and is extremely stable
(ii) Mn3+ is a strong oxidising because it can easily be converted to Mn2+ having ds configuration which is extra stable
(iii) Ti4+ is colourless because it has 3d0 configuration and therefore no unpair electrons.
(b) (i)2MnO^{-}_{4}+16H^{+}+5s^{2-}\rightarrow 2Mn^{2+}+5s+8H_{2}O
      (ii) 2KMnO_{4}\overset{\Delta }{\rightarrow}K_{2}MnO_{4}+MnO_{2}+O_{2}

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