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What are steps to be done before adding ...

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

A

Group-II filtrate is to be evaporated to dryness.

B

Group-II filtrate is to be boiled of first

C

After boiling 2-3 drops of dil. `H_(2)SO_(4)` is added and boiled again.

D

After boiling, 2-3 drops of `HNO_(3)` is added and boiled again.

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The correct Answer is:
B, D
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