(a) Complete the following chemical reaction equations : (i) MnO_(4(aq))^(-) + C_(2)O_(4(aq))^(2-) + H_((aq))^(+) to (ii) Cr_(2) O_(7 (aq))^(2-) + Fe_((aq))^(2+) + H_((aq))^(+) to (b) Explain the following observations about the transition/inner transition elements : (i) There is in general an increase in density of element from titanium (Z = 22) to copper ( Z= 29). (ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements ( 3^(rd) series). (iii) The members in the actinoid series exhibit a larger number of oxidation states than the corresponding members in the lanthanoid series.

(a) Complete the following chemical reaction equation : (i)MnO_(4(aq))^(-)+C_(2)O_(4(aq))^(2-)+H_(aq)^(+) to (ii) Cr_(2)O_(7(aq))^(2-)+Fe_((aq))+H_((aq))^+to (b) Explain the following observation about the transition /inner transition elements: (i) There is in general an increase in density of element from titanium (Z=22) to copper (Z=29) (ii) there occurs much more frequent metal bonding in compounds of heavy transition elements (3^(rd) series) (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series (a) Complete the following chemical equation for reaction: (i) 8MnO_(4)^(-)+H_(2)O+3S_(2)O_(3)^(2-) to (ii) Cr_(2)O_(7)^(2-)+3H_(2)S+8H^(+) to (b) Give an explanation for each of the following observations: (i) The gradual decrease in size (actinoid contractions) from element to element is greater among the actinoids than among the lanthanoids (lanthanoid contraction). (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital configuration (d^(4) Cr^(2+)) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

Three occurs much more frequently metal-metal bonding in the compounds of heavy transition elements (3d series ). Assign reason.

Why is ghere a general increase in density of elements from titanaium (Z=22) to copper (Z=29) ?

Explain the following observations giving an appropriate reason for each. (i) The enthalpies of atomization of transmition elements are quite high. (ii) There occurs much more frequent matal-matal bonding in compounds of heavy transition metals (i.e, 3^(rd) series). (iii) Mn^(2+) is much more resistant then Fe^(2+) toawards oxidation.

Why generally there is an increase in density of elements from titanium ( Z=22) to copper ( Z= 29 ) . In the first series of transition of transiton elements.

Explain the following observations : (i) Many of the transition elements are known to form interstitial compounds . (ii) There is a general increase in density from titanium (Z =22) to copper (Z = 29). (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series.

Explain the following observations: (i) Many of the transition elements are known to form interstitial compounds. (ii) There is a general increase in density from titanium (Z = 22) to copper (Z = 29). (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series.

Explain the following observation: (i) Generally there is an increase in density of elements from titanium (Z=22) to copper (Z=29) in the first series of transition elements. (ii) Transition elements and their compounds are generally found to be catalysts in chemical reactions.

Explain the following properties of transition elements. (i) Variable oxidation states (ii) Complex formation