Which of the following statements are correct ? (i)Arsenic and antimony are metalloids. (ii) Phosphorus, arsenic and antimony are found (iii) covalent radii increases equally from N to Bi. (iv) Elements of group 15 have extra stability and higher ionisation energy due to exactly half filled ns^(2)np^(3) electronic configuration. (v) In group 15 elements only nitrogen is gas whereas all others are solids.

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

1.	Which of the following statements are correct ? (i)Arsenic and antimony are metalloids. (ii) Phosphorus, arsenic and antimony are found (iii) covalent radii increases equally from N to Bi. (iv) Elements of group 15 have extra stability and higher ionisation energy due to exactly half filled ns^(2)np^(3) electronic configuration. (v) In group 15 elements only nitrogen is gas whereas all others are solids.
Answer» i.iv and v ii, iii and iv I, ii and iii ii, iii and v Solution :PHOSPHORUS occurs in minerals of the apatite family, `Ca_(9)(PO_(4))_(6), CaX_(2)(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 comparision to increase from As to Bi.