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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
A reducing agent
B
An oxidizing 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
Ammonium sulfate
C
Oxygen
D
Sulfur Dioxide
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
Hydrochloric acid
B
Potassium nitrate
C
Ammonium sulfate
D
Sulfuric acid
4) Which compound 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
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
Fe2+
B
Cu2+
C
Al3+
D
Zn2+
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
Ammonium chloride
C
Ammonium nitrate
D
Sodium nitrate
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
Water is produced
B
The final pH is 7
C
An insoluble salt is produced
D
A gas 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
Iron (II) and nitrate
B
Copper (II) and nitrate
C
Ammonium and iron (III)
D
Ammonium and copper (II)
9) Which gas turns acidified potassium dichromate (VI) from orange to green?
A
Oxygen
B
Sulfur Dioxide
C
Ammonia gas
D
Hydrogen
10) Which gas is produced when an alkali is warmed with ammonium sulfate?
A
Chlorine
B
Sulfur dioxide
C
Ammonia
D
Hydrogen
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