1.

Which of the following pair of acidic radical can be distinguished by using dil H_(2)SO_(4) ? (I) C_(2)O_(4)^(2-) " and" NO_(3)^(-) "" (II) NO_(3)^(-) " and" NO_(2)^(-) (III) Cl^(-) " and" Br^(-) "" (IV) HCO_(3)^(-) " and" CO_(3)^(2-)

Answer»

I and II
II only
II and IV
III and IV

Solution :
Hence, DISTINCITION is possible.
(III) Both `Cl^(-) " and" BL^(-)` have no REACTION with dil. `H_(2)SO_(4)`.
(IV) Both `HCO_(3)^(-) " and" CO_(3)^(2-)` produce `CO_(2) uarr` which EVOLVES with efferverscences.


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