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# Which of the following compound

Question:

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

1. Nitric acid

2. Ammonia

3. Hydrochloric acid

4. Sodium hydroxide

Correct Option: 1

Solution:

For testing of halogens, Nitric acid is added to the sodium extract because if $\mathrm{CN}^{-}$or $\mathrm{S}^{2-}$ are present then they will be oxidised and removed before the test of halides.