Answer :
[tex]NH_{4} Br ,FeCl_{3}[/tex] are acidic, [tex]Na_{2} CO_{3}, NaHC_{2} O_{4}[/tex] is basic and [tex]KClO_{4}[/tex] is neutral.
The salt which upon hydrolysis form strong acid and weak base it's aqueous solution is acidic, and the salt which on hydrolysis gives strong base and weak acid it's aqueous solution is basic. So -
[tex]NH_{4} Br + H_{2} O- > NH_{4}OH+HBr[/tex] , HBr is a strong acid.
[tex]Na_{2}CO_{3} +H_{2}O- > NaOH+ H_{2}CO_{3}[/tex],NaOH is a strong base.
And the salt which upon hydrolysis form a strong acid and strong base is neutral,[tex]KClO_{4}[/tex]
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