I would say that it is answer choice J. This is because A-E is currently and utterly incorrect and will not be right.
Independent variable would be salt since you can't change it in this experiment.
The answer to question 1 is B and to question 2 is A
3. Covalent/binary (not really sure)
4. Covalent
5. Ionic
6. Covalent
7. Acid
8. Ionic
9. Acid
10. Ionic