Lesson 4C.1
4C.1 Tests for identifying inorganic ions Quiz: Pearson Edexcel Chemistry, Unit 4
20 questions
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Lesson 4C.1, Tests for identifying inorganic ions: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 4: Inorganic Chemistry and the Periodic Table, written with Revision Ninja.
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The 20 questions
-
Which reagent is added to test for carbonate ions in aqueous solution?
- Silver nitrate
- Dilute acid
- Sodium hydroxide
- Barium chloride
-
What is the ionic equation for the reaction of carbonate ions with acid?
- CO3 2- + 2H+ -> CO2 + 2H2
- CO3 2- + H+ -> HCO3-
- CO3 2- + 2H+ -> CO2 + H2O
- CO3 2- + H+ -> CO2 + OH-
-
Which reagent forms a white precipitate in the presence of aqueous sulfate ions?
- Calcium carbonate
- Silver nitrate
- Sodium hydroxide
- Barium chloride
-
What is the correct ionic equation for the test for sulfate ions?
- Ba2+ + CO32- -> BaCO3
- Ba2+ + SO42- -> BaSO4
- Ba+ + SO4- -> BaSO4
- Ba2+ + SO32- -> BaSO3
-
Which reagent and condition are used to release ammonia gas from ammonium ions?
- Warm with NaOH
- Cold dilute HCl
- Cold aqueous AgNO3
- Warm with HNO3
-
What is the ionic equation for the reaction of ammonium ions with hydroxide ions?
- NH3 + H+ -> NH4+
- NH4+ + H+ -> NH52+
- NH4+ + Cl- -> NH4Cl
- NH4+ + OH- -> NH3 + H2O
-
Which acidified reagent is used to test for aqueous halide ions?
- Sodium hydroxide
- Barium chloride
- Silver nitrate
- Lead nitrate
-
Which silver halide precipitate is yellow?
- Silver fluoride
- Silver iodide
- Silver bromide
- Silver chloride
-
Why is dilute nitric acid added before silver nitrate when testing for halide ions?
- Oxidise halide ions
- Dissolve silver halide
- Remove carbonate ions
- Neutralise silver ions
-
Which reagent produces effervescence with carbonate ions but no gas with sulfate ions?
- Sodium hydroxide
- Silver nitrate
- Dilute acid
- Barium chloride
-
What visual change occurs when carbon dioxide gas is bubbled through limewater?
- Remains clear
- Turns brown
- Turns blue
- Turns cloudy
-
What observation confirms the presence of sulfate ions when acidified barium chloride is added?
- Cream precipitate
- White precipitate
- Yellow precipitate
- Brown precipitate
-
What is the ionic equation for the formation of the yellow precipitate in the iodide test?
- Ag + I -> AgI
- Ag+ + 2I- -> AgI2
- Ag+ + I- -> AgI2
- Ag+ + I- -> AgI
-
Why are flame tests unsuitable for identifying most transition metal ions?
- Form white smoke
- Instantly decompose
- Form volatile compounds
- Lack distinctive colours
-
What is observed when dilute acid is added to a solid carbonate?
- Effervescence
- Brown gas
- White precipitate
- Colourless solution
-
What are the products when hydrogencarbonate ions react with hydrogen ions?
- CO and H2O
- CO2 and OH-
- CO2 and H2O
- CO2 and H2
-
A solution forms a white precipitate with acidified barium chloride. Which ion is present?
- Chloride
- Sulfate
- Carbonate
- Nitrate
-
Which reagent is added first when testing a solution for carbonate and sulfate ions?
- Sodium hydroxide
- Silver nitrate
- Dilute acid
- Barium chloride
-
Why is barium chloride solution acidified when testing for sulfate ions?
- Neutralises sulfate
- Speeds up reaction
- Removes carbonate ions
- Oxidises barium
-
Why is the mixture warmed when testing for ammonium ions with sodium hydroxide?
- Dissolves precipitate
- Oxidises ammonium
- Releases ammonia gas
- Neutralises hydroxide
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