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Priyanshu kumar Best Answer
(b) complex Co(nh3)6 3+ is thermodynamically unstable but kinetically inert (f) The "F-block elements" are called as the “inner-transition elements” because of their unique electronic configuration. The valence electrons of these elements transitions into the (n-2) f block which is the "anti-penultimate energy level" and lies in the f-orbital. Hence these are called as 'inner transition elements'. (g)👇
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