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Qualitative Analysis
Test Description: Tan Kai, Shawn 3A1 25
Instructions: Answer all questions to get your test result.
1) Which compounds in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess of ammonia is added?
A
Zinc chloride
B
Copper(II) sulfate
C
Potassium hydroxide
D
Iron(II) chloride
2) _____ reacts with some metals to liberate hydrogen and is used to make fertilizers. It gives a white precipitate when added to aqueous barium nitrate.
A
Ammonium sulfate
B
Potassium nitrate
C
Sulfuric acid
D
Hydrochloric acid
3) Solution X turns acidified potassium dichromate(VI) from orange to green. What must solution X contain?
A
A reducing agent
B
An oxidizing agent
C
An ammonium salt
D
An alkali
4) Wastewater from a factory was found to have a pH value of 2. Which substance could be used to neutralize the wastewater before it is released into the river?
A
Oxygen
B
Ammonium sulfate
C
Sulfur dioxide
D
Lime
5) An excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. Ammonia gas is only given off after aluminium foil is added to the hot solution. What could X contain?
A
Ammonium chloride
B
Sodium chloride
C
Ammonium nitrate
D
Sodium nitrate
6) Aqueous sodium hydroxide reacts with a metal ion producing a colored precipitate. This precipitate changes color on standing. What is the ion present?
A
Cu^2+
B
Fe^3+
C
Al^3+
D
Zn^2+
7) An excess of aqueous ammonia and aqueous sodium hydroxide was gradually added to solution X in two separate experiments. In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?
A
Copper(II) nitrate
B
Iron(II) nitrate
C
Iron(III) nitrate
D
Zinc nitrate
8) An excess of dilute sulfuric acid reacts with both aqueous barium hydroxide and aqueous barium chloride. In what way are the two reactions the same?
A
A gas is produced
B
The final pH is 7
C
Water is produced
D
An insoluble salt is formed
9) A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does X contain?
A
Iron(II) and nitrate
B
Ammonium and iron(II)
C
Ammonium and copper(II)
D
Copper(II) and nitrate
10) Which two substances would form a white precipitate?
A
Sulfuric acid and aluminium nitrate
B
Hydrochloric acid and calcium nitrate
C
Sulfuric acid and barium nitrate
D
Nitric acid and zinc nitrate
*select an answer for all questions
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