The names of formula of the following sentence are given below.

1. i. corundum ,Al₂O₃

2. ii. cryolite, AlF₃,3NaF

3. iii. cerusite, PbCO₃

which statement are correct?

The names and formulas of the given substances are as follows:

i. Corundum: Al2O3

• The name is correct, and the formula is correct.

ii. Cryolite: AlF3, 3NaF

• The name is correct, but the formula representation might be confusing. The correct way to represent the formula is AlF3 · 3NaF, indicating that there are three moles of NaF for every mole of AlF3.

iii. Cerussite: PbCO3

• Both the name and the formula are correct.

So, all three statements are correct.