Silver nitrate solution can be added to a solution to test for the presence of chloride ions. In this test, dilute nitric acid is added to the solution followed by the silver nitrate solution. What is the purpose of addition of nitric acid to make this a reliable test.

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To decompose anions such as carbonate etc which give precipitate with silver nitrate

To dilute the solution of chloride ions

To prevent the hydrolyses of given salt which form insoluble hydroxide precipitate

To stop the white precipitate changing colour

answer is B, C.

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Detailed Solution

Anions such as $C O_{3}^{2 -},$ decompose on adding $d i l H N O_{3}$ which give white ppt with silver nitrate. Salts like $A l C l_{3}$ hydrolyse in water forming $A l {(O H)}_{3}$ interfering with the precipitate of $A g C l .$

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