What are steps to be done before adding group-III reagent into the group-II filtrate?

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Group-II filtrate is to be evaporated to dryness.

Group-Il filtrate is to be boiled of first.

After boiling 2-3 drops of dil. $H_{2} {SO}_{4}$ is added and boiled again.

After boiling, 2-3 drops of ${HNO}_{3}$ is added and boiled again.

answer is B, D.

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Detailed Solution

Steps to be done before adding group-III reagent into the group-II filtrate are,

(i) Group-Il filtrate is to be boiled of first.

(ii) After boiling, 2-3 drops of ${HNO}_{3}$ is added and boiled again.

Hence, the correct options are b and d.

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