Lesson 5.3.2
5.3.2 Qualitative analysis Quiz: OCR Chemistry, Unit 4
20 questions
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Lesson 5.3.2, Qualitative analysis: 20 multiple choice questions for the OCR Chemistry (H432), Unit 4: Physical chemistry and transition elements, written with Revision Ninja.
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The 20 questions
-
Which reagent is used to test for carbonate ions in an unknown compound?
- Dilute acid
- Sodium hydroxide
- Barium chloride
- Silver nitrate
-
What precipitate is formed when carbon dioxide is bubbled through limewater?
- Calcium chloride, CaCl2
- Calcium hydroxide, Ca(OH)2
- Sodium carbonate, Na2CO3
- Calcium carbonate, CaCO3
-
What colour precipitate forms when silver nitrate is added to aqueous chloride ions?
- White
- Cream
- Yellow
- Brown
-
A cream precipitate forms with acidified silver nitrate, and it is partly soluble in concentrated ammonia. Which ion is most likely present?
- Sulfate, SO4^2-
- Bromide, Br-
- Chloride, Cl-
- Iodide, I-
-
A yellow precipitate forms with acidified silver nitrate solution, and this precipitate does not dissolve in concentrated ammonia. Which ion is present?
- Chloride, Cl-
- Carbonate, CO3^2-
- Bromide, Br-
- Iodide, I-
-
Which reagent is used to test for sulfate ions in an acidified aqueous solution?
- Limewater
- Barium chloride
- Sodium hydroxide
- Silver nitrate
-
Which ion is removed by adding nitric acid before testing for halide ions?
- Carbonate
- Sulfate
- Ammonium
- Nitrate
-
Which gas is evolved when ammonium ions are heated with aqueous sodium hydroxide?
- Hydrogen
- Nitrogen
- Ammonia
- Oxygen
-
What colour precipitate forms when sodium hydroxide is added to aqueous iron(II) ions?
- Green
- Blue
- White
- Rust-brown
-
Which ion gives a pale buff precipitate with aqueous sodium hydroxide that darkens on standing in air?
- Cr3+
- Mn2+
- Cu2+
- Fe3+
-
A solution gives a pale blue precipitate with NaOH which is insoluble in excess. Which ion is most likely present?
- Fe2+
- Mn2+
- Cu2+
- Cr3+
-
Which gas turns damp red litmus paper blue?
- Hydrogen chloride, HCl
- Ammonia, NH3
- Hydrogen, H2
- Carbon dioxide, CO2
-
Why is hydrochloric acid unsuitable for acidifying a solution before testing for halide ions?
- Forms toxic gas
- Oxidises halides
- Neutralises silver
- Adds chloride ions
-
Which halide ion produces no precipitate upon adding aqueous silver nitrate solution?
- Fluoride
- Bromide
- Chloride
- Iodide
-
What is observed when aqueous silver nitrate is added to ammonium chloride solution?
- White precipitate
- No reaction
- Cream precipitate
- Yellow precipitate
-
Which reagent is used to confirm the presence of sulfate ions in solution?
- Sodium hydroxide
- Silver nitrate
- Barium chloride
- Dilute ammonia
-
Which reagent is used to test a sample for the presence of carbonate ions?
- Silver nitrate
- Sodium hydroxide
- Barium chloride
- Dilute acid
-
Which reagent and process are used to test for ammonium ions in solution?
- Warm with NaOH
- Acidify with HCl
- Add barium chloride
- Add silver nitrate
-
What colour precipitate forms when silver nitrate is added to bromide ions?
- Yellow
- Brown
- White
- Cream
-
What colour change occurs when damp litmus paper detects ammonia gas?
- Blue to red
- Red to white
- Blue to white
- Red to blue
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