Qualitative Analysis

Qualitative Analysis

By Angela Toh

Multiple Choice

What colour does litmus paper turn in the presence of chlorine?

• Red

• Blue

• Red then White

• Yellow

Multiple Choice

What is the test for ammonia gas (NH₃)?

• turns damp red litmus blue

• forms white precipitate in limewater

• bleaches damp litmus paper

• extinguishes a lighted splint with a 'pop' sound

Multiple Choice

This test tube may contain Hydrogen. How could we test for this?

• Insert a glowing splint

• Insert a lighted splint

• Use litmus papers

• Squeaky pop

Multiple Choice

What is the test for oxygen gas (O₂)?

• turns damp red litmus blue

• relights a lighted splint

• bleaches damp litmus paper

• relights a glowing splint

Multiple Choice

NaOH is added to an unknown solution. A blue precipitate forms. The formula of the ion present is:

• Fe
• Fe³⁺

• Fe²⁺

• Cu²⁺

Multiple Choice

NaOH is added to an unknown solution. A reddish brown precipitate forms. The formula of the ion present is:

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Cl^-

Multiple Select

NaOH is added to an unknown solution. A white precipitate forms. The formula of the ion present can be:

• Zn²⁺

• Al³⁺

• Pb²⁺

• Ca²⁺

Multiple Select

Aqueous ammonia is added to an unknown solution. A white precipitate forms. The formula of the ion present can be:

• Zn²⁺

• Al³⁺

• Pb²⁺

• Ca²⁺

Multiple Choice

Which of the following will form an anion?

• Tin

• Lead

• Chlorine

• Zinc

Multiple Choice

Silver nitrate and Nitric acid were mixed with an unknown solution. A yellow precipitate formed. The formula of the ion present is

• I₂

• I⁺

• I^-

• Br^-

Multiple Choice

Test for chloride ions is....

• Add hydrochloric acid
• Add barium chloride solution

• Add nitric acid then silver nitrate or lead(II) nitrate solution

Multiple Choice

Silver nitrate and Nitric acid were mixed with an unknown solution. A white ppt formed. The formula of the ion present is

• CI^-

• Cl₂

• I^-

• Cl⁺

Multiple Select

Test for sulfate ions is...

• Add barium chloride

• Add barium nitrate

• Add silver nitrate

• Add only hydrochloric acid

Multiple Choice

Dilute hydrochloric acid is added to a colourless solution. Bubbles of gas appear immediately and this gas forms a white precipitate with limewater. What ion was present in the solution?

• Carbonate

• Sulfate

• Nitrate

• Chloride

Multiple Choice

What is the purpose of adding acid when testing for chloride or sulfate ions?

• to release carbon dioxide

• to form the precipitate

• to remove carbonate ions

• to provide an acidic medium

Multiple Choice

Which acid should you use when testing for chloride ions with silver nitrate?

• hydrochloric acid

• carbonic acid

• nitric acid

• sulfuric acid

Multiple Choice

Which acid should you use when testing for chloride ions with lead(II) nitrate?

• hydrochloric acid

• carbonic acid

• nitric acid

• sulfuric acid

Multiple Choice

Which acid should you use when testing for sulfate ions with barium nitrate?

• hydrochloric acid

• carbonic acid

• nitric acid

• sulfuric acid

Open Ended

Suggest why acids are added when testing for chloride or sulfate ions?

Multiple Choice

A solution X when added into sodium carbonate solution, the gas that is formed forms white precipitate with limewater. Which of the following is solution X?

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

Multiple Choice

How can aluminium sulfate and zinc sulfate solution be differentiated?

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

Multiple Choice

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

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

Multiple Choice

What is the observation when potassium iodide solution is added to a lead(II) nitrate solution?

• No changes
• A white precipitate is formed
• A yellow precipitate is formed
• Effervescence is observed

Multiple Choice

Salt X is added to sodium hydroxide solution and the mixture is heated. The gas evolved turns moist red litmus paper blue. What ion is present in salt X?

• Nitrate ion
• Ammonium ion
• Carbonate ion
• Lead(II) ion

Multiple Choice

NaOH is added to an unknown solution. A strong smell is given off. The formula of the ion is:

• Cl^-

• Br₂

• NH₄⁺

• I^-

Multiple Choice

When solid Y is heated strongly, a gas that forms white precipitate with limewater. Which of the following could be solid Y?

• carbon dioxide

• Potassium sulfate

• Lead(II) chloride

• Magnesium carbonate