Which one of the following is an ambidentate ligand?
Ethane-1,2-diamine
Ethylenediaminetetraacetate ion
Thiocyanate
Oxalate
The correct order of increasing metallic character of $\mathrm{Na}, \mathrm{Be}, \mathrm{P}, \mathrm{Mg}$ and Si is
$\mathrm{P}<\mathrm{Si}<\mathrm{Be}<\mathrm{Mg}<\mathrm{Na}$
$\mathrm{P}<\mathrm{Si}<\mathrm{Na}<\mathrm{Mg}<\mathrm{Be}$
$\mathrm{P}<\mathrm{Mg}<\mathrm{Be}<\mathrm{Si}<\mathrm{Na}$
$\mathrm{Be}<\mathrm{Si}<\mathrm{P}<\mathrm{Mg}<\mathrm{Na}$
$$ \text { Match List I with List II: } $$
Choose the correct answer from the options given below :
A-II, B-III, C-I, D-IV
A-II, B-III, C-IV, D-I
A-II, B-IV, C-III, D-I
A-I, B-III, C-IV, D-II
Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:
After losing one more electron, it acquires $4 f^{14}$ electronic configuration.
Its nearest inert gas is Radon.
Its atomic number is 61 .
After losing one more electron, it acquires $4 f^0$ electronic configuration.
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