(i) The product of a number and its product is _________.
(ii) The rational number _________ has no reciprocal.
(iii) The reciprocal of the reciprocal of a number is _________.
(iv) The rational number _________ is neither positive nor negative.
(v) _________ is the only rational number which is equal its additive inverse.
(i) A rational number which has no reciprocal.
(ii) A rational number whose product with a given rational number is equal to the given rational number.
(iii) A rational number which is equal to its reciprocal.