Identifying Anions in Solution (HSC SSCE Chemistry): Quizzes

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Identifying Anions in Solution
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What observation confirms CO32−\text{CO}_3^{2-} when dilute HNO3\text{HNO}_3 is added?

Bubbles of colourless gas

What colour is the precipitate when AgNO3\text{AgNO}_3 is added to Br−\text{Br}^-?

Pale cream

Which silver halide dissolves only in concentrated ammonia?

AgBr\text{AgBr}

Why must samples be acidified before adding AgNO3\text{AgNO}_3 for halide testing?

Prevent false positives from CO32−\text{CO}_3^{2-}

At what pH does PO43−\text{PO}_4^{3-} precipitate with Ba2+\text{Ba}^{2+}?

pH > 6 (alkaline)

What colour precipitate confirms PO43−\text{PO}_4^{3-} with ammonium molybdate?

Yellow

Which three anions produce alkaline solutions?

OH−\text{OH}^-, CO32−\text{CO}_3^{2-}, CH3COO−\text{CH}_3\text{COO}^-

What happens when red litmus paper is added to OH−\text{OH}^- solution?

Red litmus turns blue

What colour forms when neutral FeCl3\text{FeCl}_3 is added to CH3COO−\text{CH}_3\text{COO}^-?

Reddish brown solution

Does AgI\text{AgI} dissolve in concentrated ammonia?

No, it doesn't dissolve

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