Question

the salt solution reacts with Ba(NO3)2 solution to give a white ppt insoluble in dil. HNO3​

Answer 1

Answer: $Na_{2} SO_{4}$

Explanation:

Ba(NO3)2 + Na2SO4 → BaSO4 + 2 NaNO3

Here Na2SO4 is the salt solution and BaSO4 is the white precipitate soluble in HNO3