Chemistry Help!

[nehaoscar]

Why is it D... I thought it would be C because
- pale yellow ppt is formed by Br- when reacted with Silver nitrate
- white ppt for Cl-
- cream ppt for I-
and
- Cl- is soluble
- I- is soluble in concentrated ammonia
- Br- is insoluble

So if it is partly dissolved, and a darker yellow ppt is present, shouldn't Br- be present instead of I- because I- will also dissolve therefore there will be no ppt remaining after ammonia is added.....???

 

[DarkEclipse]

You're thinking too hard! You confused me at first, but anyway, let's look at this step by step.
First off, when silver nitrate was added, a pale yellow precipitate formed. This means an iodide anion was present, which means options C and A are automatically wrong.
So your answer is either B or D. When ammonia is added, the precipitate got darker. Which means whatever was making it lighter has dissolved, meaning there was a second compound present. Since the chloride anion's white precipitate dissolves in aqueous ammonia, this automatically makes D the correct answer.