Qualitative Analysis: Question Preview (ID: 3869)

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Which compounds 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

_____ 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) Hydrochloric acid
c) Potassium nitrate
d) Sulfuric acid

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) Oxygen
c) Lime
d) Sulfur dioxide

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

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) Al^3+
c) Zn^2+
d) Fe^3+

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) Iron(II) nitrate
b) Iron(III) nitrate
c) Zinc nitrate
d) Copper(II) 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) Water is produced
c) The final pH is 7
d) An insoluble salt is formed

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

Which two substances would form a white precipitate?
a) Hydrochloric acid and calcium nitrate
b) Nitric acid and zinc nitrate
c) Sulfuric acid and aluminium nitrate
d) Sulfuric acid and barium nitrate

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