What happens when a condition of metal oxide is tested with (i)blue litmus (ii)red litmus please give the answer as fast as you can

What is the strongest intermolecular force between an nacl unit and an h2o molecule together in a solution? covalent bonding dipole-dipole force hydrogen bonding ion-dipole force

Idon’t know how to solve this question

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction