Please help me on this

Cr(oh)3 -> cr(3+) + 3oh-

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.