Question

solution X,Y,Z have ph value 8,9,10 respectively. arrange the increasing order or basic

Answer 1

more is pH base concentration increases
7 is neutral below 7 is acidic above 7 is basic
now your question
increasing order of base is X<Y<Z

Answer 2

It will be Z,Y,X.
It means 10,9,8 because if the pH of a solution will increase then it's will become basic in nature.