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

Fill in the Blank

Carbon dioxide gives a white precipitate with limewater. What is the chemical name of this precipitate?

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⁺

Fill in the Blank

NaOH is added to an unknown solution. A green precipitate forms. The name of the precipitate is:

Fill in the Blank

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

Fill in the Blank

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

Fill in the Blank

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

Fill in the Blank

NaOH is added to an unknown solution. A white precipitate forms and the precipitate is insoluble in excess. The name of the precipitate can be:

Fill in the Blank

Aqueous ammonia is added to an unknown solution. A white precipitate forms and the precipitate dissolves in excess aqueous ammonia. The name of the precipitate can be:

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

Fill in the Blank

NAME the reagent that can be added to test for iodide ions.

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

Fill in the Blank

NAME the reagent that should be added before barium nitrate to test for sulfate ions.

Fill in the Blank

NAME the reagent that should be added before barium chloride to test for sulfate ions.

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

Fill in the Blank

State one reagent that can be used to differentiate sodium carbonate solution and sodium chloride?

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