Which of the following is an acidic salt/

Which of the following is/are acidic salts?

Which of the following is not an acidic salt ?

Which of the following is not an acidic salt ?

Which of the following is not an acidic salt?

Which of the following is not an acidic salt?

Which of the following is not an acidic salt solution in aqueous medium?

Which of the following are acidic salts ?(i)copper sulphate,(ii)common salt (iii) sodium carbonate (iv)sodium bicorbonate