Which of the following statements are correct?(i) Arsenic and antimony are metalloids.(ii) Phosphorus, arsenic and antimony are found mainly as sulphide minerals.(iii) Covalent redii increases equally from N to Bi.(iv) Elements of group 15 have extra stability and higher ionisation energy due to exactly half filled ns2np3 electronic configuration.(v) In group 15 elements only nitrogen is gas whereas all others are solids.(a) (i), (iv) and (v) (b) (ii), (iii) and (iv)(c) (i), (ii) and (iii) (d) (ii), (iii) and (v)

Which of the following statements are correct?(i) Arsenic and antimony

1.	Which of the following statements are correct?(i) Arsenic and antimony are metalloids.(ii) Phosphorus, arsenic and antimony are found mainly as sulphide minerals.(iii) Covalent redii increases equally from N to Bi.(iv) Elements of group 15 have extra stability and higher ionisation energy due to exactly half filled ns2np3 electronic configuration.(v) In group 15 elements only nitrogen is gas whereas all others are solids.(a) (i), (iv) and (v) (b) (ii), (iii) and (iv)(c) (i), (ii) and (iii) (d) (ii), (iii) and (v)
Answer» (a) Phosphorus occurs in minerals of the apatite family, Ca₉(PO₄)₆, CaX₂ (X = F, Cl or OH) which are main components of phosphate rocks whereas arsenic and antimony are found as sulphide minerals. The increase in covalent radii from N to P is greater in comparison to increase from As to Bi.

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