Write:

**(i)** The rational number that does not have a reciprocal.

**(ii)** The rational numbers that are equal to their reciprocals.

**(iii)** The rational number that is equal to its negative.

**(i)** We know that there is no rational number which when multiplied with 0, gives 1. Therefore, the rational number 0 has no reciprocal.

**(ii)** We know that the reciprocal of 1 is 1 and the reciprocal of -1 is -1. 1 and -1 are the only rational numbers which are their own reciprocals.

**(iii)** The rational number 0 is equal to its negative.