Qualitative Analysis

Which cation gives a green precipitate with NaOH?

• Fe⁺²

• Al⁺³

• Ca⁺²

• Cu⁺²

• Fe⁺³

Which cation gives a brick red precipitate with NaOH?

• Fe⁺²

• Al⁺³

• Ca⁺²

• Cu⁺²

• Fe⁺³

Which cation gives a blue precipitate with NaOH?

• Fe⁺²

• Al⁺³

• Ca⁺²

• Cu⁺²

• Fe⁺³

Which cation gives a soluble white precipitate with excess NH₄OH?

• Ca⁺²

• Al⁺³

• Zn⁺²

• Mg⁺²

• Pb⁺²

All of the following salts are soluble except...

• Lead(II) nitrate
• Sodium carbonate
• Magnesium chloride
• Barium sulphate

What does the gas/ gases collected tell us about the salt?

• Type of cation 
• Type of anion
• Reactivity with oxygen
• Volatility

A solution X when added into sodium carbonate solution turns limewater cloudy. which of the following is solution X?

• Aqueous ammonia solution
• Calcium hydroxide solution
• Vinegar
• Magnesium nitrate solution

When solid Y is heated strongly, a gas that turns limewater milky is produced, leaving a white residue. Which of the following could be solid Y?

• Zinc carbonate
• Potassium carbonate
• Lead(II) carbonate
• Magnesium carbonate

How can aluminium sulphate and zinc sulphate solution be differentiated?

• Addition of silver nitrate solution
• Addition of aqueous ammonia
• Addition of sodium hydroxide solution
• Addition of barium chloride solution

What reagent can be used to differentiate hydrochloric acid and sulphuric acid?

• Silver nitrate solution
• Sodium hydroxide solution
• Sodium carbonate solution
• Ammonia solution