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