Question

If an acid is added to milk it's ph will reduce forming curd.But is it possible that if a base is added to curd it can form milk back?

Answer 1

No, it is surely not possible. When an acid (lemon, vinegar, etc) is added to the milk, the curd is formed, which is an entirely different product (a compound), not a mixture of acid and milk. So, when you add a base to the curd, there is no acid in there to react with the base.