Fill in the blanks:

(i) The product of two positive rational numbers is always………..

(ii) The product of a positive rational number and a negative rational number is always ……..

(iii) The product of two negative rational numbers is always………..

(iv)The reciprocal of a positive rational numbers is ………..

(v) The reciprocal of a negative rational number is………..

(vi) The product of a rational number and its reciprocal is……..

(vii) Zero has……. reciprocal

(viii) The numbers……. and….. are their own reciprocals.

(ix)If a is reciprocal of b, then the reciprocal of b is ………

(x) The number 0 is ……… the reciprocal of any number.

(xi) Reciprocal of is

(xii)