QA: Question Preview (ID: 3932)

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Solution X turns acidified potassium dichromate (VI) from orange to green. What must solution X contain?
a) An alkali
b) An ammonium salt
c) An oxidizing agent
d) A reducing agent

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) Ammonium sulfate
b) Lime
c) Oxygen
d) Sulfur Dioxide

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) Potassium nitrate
d) Sulfuric acid

Which compound in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess of ammonia is added?
a) Copper (II) sulfate
b) Iron (II) chloride
c) Potassium hydroxide
d) Zinc Chloride

Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?
a) Al3+
b) Cu2+
c) Fe2+
d) Zn2+

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) Ammonium chloride
b) Ammonium nitrate
c) Sodium chloride
d) Sodium nitrate

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) An insoluble salt is produced
c) The final pH is 7
d) Water is produced

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) Ammonium and copper (II)
b) Ammonium and iron (III)
c) Copper (II) and nitrate
d) Iron (II) and nitrate

Which gas turns acidified potassium dichromate (VI) from orange to green?
a) Sulfur Dioxide
b) Oxygen
c) Ammonia gas
d) Hydrogen

Which gas is produced when an alkali is warmed with ammonium sulfate?
a) Hydrogen
b) Chlorine
c) Sulfur dioxide
d) Ammonia

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