QA Multiple Choice Test

Solution X turns acidified potassium dichromate (VI) from orange to green. What must solution X contain?

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?

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?

Which compound in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess of ammonia is added?

Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?

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

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 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

Which gas turns acidified potassium dichromate (VI) from orange to green?

Which gas is produced when an alkali is warmed with ammonium sulfate?

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