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Test Description: :D
Instructions: Answer all questions to get your test result.
1) Solution X turns acidified potassium dichromate (VI) from orange to green. What must solution X contain?
A
An oxidizing agent
B
A reducing agent
C
An ammonium salt
D
An alkali
2) 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
Lime
B
Sulfur Dioxide
C
Oxygen
D
Ammonium sulfate
3) Compound X reacts with some metals to liberate hydrogen and is used to make fertilisers. It gives a white precipitate when added to aqueous barium nitrate. What is X?
A
Ammonium sulfate
B
Hydrochloric acid
C
Sulfuric acid
D
Potassium nitrate
4) Which compound in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess of ammonia is added?
A
Potassium hydroxide
B
Iron (II) chloride
C
Zinc Chloride
D
Copper (II) sulfate
5) Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?
A
Zn2+
B
Fe2+
C
Cu2+
D
Al3+
6) An excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. Ammonia gas was only given off after aluminium foil is added to the hot solution. What could X b
A
Sodium chloride
B
Sodium nitrate
C
Ammonium nitrate
D
Ammonium chloride
7) 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
The final pH is 7
B
An insoluble salt is produced
C
A gas is produced
D
Water is produced
8) 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 wth powdered aluminium. Which i
A
Copper (II) and nitrate
B
Ammonium and iron (III)
C
Iron (II) and nitrate
D
Ammonium and copper (II)
9) Which gas turns acidified potassium dichromate (VI) from orange to green?
A
Hydrogen
B
Sulfur Dioxide
C
Ammonia gas
D
Oxygen
10) Which gas is produced when an alkali is warmed with ammonium sulfate?
A
Chlorine
B
Hydrogen
C
Sulfur dioxide
D
Ammonia
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