The ionic radii (in Å) of N3–, O2– and F– are respectively:

The species Cl- , K+ and Ca2+ contain the same number of electrons. In which order do their radii in

(A), (B) and (C) are elements in the second short period. Oxide of (A) is ionic, that of (B) is amph

The basic character of MgO, SrO, K₂O and NiO increases in the order -

Arrange into the order of increasing basicity (NO₂, K₂O, ZnO) -

Arrange the following hydrides in their increasing acid strength [CH₄, H₂S, PH₃ and SiH₄] -