Give reason (one each) for the following:
(a) Transition metals are good catalytic agent
(b) Second ionisation enthalpy of copper is very high.
(c) The spin only magnetic moment of `Sc^(3+)` is zero (Z = 21).

Give reason (one each) for the following. a) Transition metals are good catalytic agents. b) Second ionisation Enthalpy of copper is very high. c) The spin only magnetic moment of Sc^(3+) is zero (Z = 21) .

Give reason (one each) for the following : Transition metal are good catalytic agent

Give reason (one each) for the following : Second ionisation enthalpy of copper is very high.

Give reason (one each) for the following : The spin only magnetic moment of Se^(3+) is zero (Z=21)

(a) 3d Transition metals and their compounds are good catalysts. Give two reasons?2 (b) Give the formula for the calculation of spin only magnetic moment.

Give reasons for the following: a. Ionic compounds in general have high melting and boiling points. b. Highly reactive metals cannot be obained from their oxides by heating them with carbon. c. Copper vessel get a green coat when left exposed to air in the rainy season.

The elements Be, Mg, and 20Ca each having two valence electrons in their valence shells are in periods 2, 3, and 4 respectively of the Modern Periodic Table. Answer the following questions associated with these elements, giving reason in each case. a] In which group should they be? b] Which one of these is least reactive? c] Which one of them has the largest atomic size?