Fill in the blanks :
(i) Zero has ……………. reciprocal.
(ii) The numbers ……………. and ………. are their own reciprocals.
(iii) The reciprocal of – 5 is …………….
(iv) Reciprocal of 1/x, where ≠ 0 is ………
(v) The product of two rational numbers is always a ………….
(vi) The reciprocal of a positive rational number is …………
