silica derivatives

Q1When OH groups strongly attached with SiO2 derivatives
a)Acidic strength inc
b)acidic strength remains same
c)basic strength inc
d)cataytic activity inc

Q2Due to availabltiy of lewis acid and bronsted in sites of natural materials
a)diff plaecs have diff ph of soil
b)diff places have same ph of soil
c)non conductive nature of water(natural)
d)same fertility of soil