" a) What is lanthanoid contraction? "

(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.

(a) Give preparation of potassium permanganate (KMnO_4) . (b) What is lanthanoid contraction, give its cause. (c ) Transition metals show catalytic properties. Explain.

(i) Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element. (ii) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

(a) What is Lanthanoids contraction ? (b) What are Interstial compounds ? Give one example (c) Calculate the spin only magnetic moment of M^(2+)(aq) ion [Z=29].

Give reasons: What is lanthanoid contraction?

Assign reasons for the following: What is lanthanoid contraction ? Explain its any one consequence.

What are lanthanoids? Give their general electronic configurations. What is lanthanoid contraction?

What is lanthanoid contraction? Accound for such contraction.

What is lanthanoid contraction? Mention the cause for it.