Interstitial Compounds

Properties OF Transition Element|| Melting Point and Boiling Point||Oxidation||Electrode Potential||Magnetic Behaviour|| Formation OF Interstitial Compounds|| Catalytic Properties|| Formation OF Non Stoichiometric Compounds||Complex & Alloy Formation

"Catalytic Properties,Trends in Electrode Potential Values , Alloy Formation,Interstitial Compound,Preparation and Properties OF K2Cr2O7 "

Which of the following statements about the interstitial compounds is incorrect? (a) They retain metallic conductivity (b) They are chemically reactive (c) They are much harder than the pure metal (d) They have higher melting points than the pure metal

(a) Why are Mn^(2+) compounds more stable than Fe^(2+) towards oxidation to their +3 state. (b) What are interstitial compounds ? Why are such compounds well-known for transition metals ? (c ) Write electronic configuration of Pm^(3+)

(a) How would you account for the following : (i) Cobalt (II) is stable in aqueous solution but in the presence of strong ligands, it is easily oxidised. (ii) The transition metals form interstitial compounds. (iii) Silver halides find use in photography. (b) What is lanthanoid contraction ? Mention its main consequences.

(i) Which of the first row transition metal exhibit +7 oxidation state? (ii) How would you account for the irregular variation of 1st and 2nd ionisation enthalpies in the 1st series of transition elements ? (iii) What are interstitial compounds ? (iv) Give two uses of potassium permanganate.

Pick out the correct statement set for transition metals 1. They form interstitial compounds 2. 5d- elements have higher energies than 3d 4d - elements 4. They have low melting and boiling points (or low enthallpies of atomization)