How many statements are correct?

1.Prismatic borax has 10 water molecules

2.Borazine undergoes hydrolysis at very high T and gives ammonia and boric acid

3.Pyrosilicates contains two units of $Si{O}_4^{-4}$

4.SnS is soluble in yellow ammonium sulphide and its basic in nature

5. Red lead is $P{b}_3{O}_4$

6. Nitrogen di oxide is a mixed anhydride.

7. As per VSEPR the shape of $N{O}_2^{+}$ is Linear.

8.If the difference in Electronegativity is 1.9, then the compound is equally ionic and covalent.