Arsenate Ion Reactions Quiz: Test Your Knowledge

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Questions and Answers

What color change is observed when BaCl2 solution is added to a solution containing Iodide Ion (I2)?

Blue/Violet precipitate

Scarlet red precipitate

Yellow precipitate (correct)

No visible change

How is Iodine vapor liberated when concentrated H2SO4 decomposes iodides?

It forms a blue/violet gas (correct)

It creates a white cloud

It turns yellow

It becomes colorless

What is the result of mixing a solution containing nitrate ions with MnCl2 and HCl?

No visible reaction

Pink color change

Green color change

Brown gas evolution (correct)

How can oxidizing agents be detected in the presence of Iodide ions?

By reacting with iodine to form a blue to black color with starch solution Signup and view all the answers

What color does the solution containing nitrate ions turn during the Brown-Ring Test when mixed with FeSO4 solution underlaid with conc’d?

Brown Signup and view all the answers

In the detection process described, what color change indicates the presence of gaseous oxidizers?

Blue to black Signup and view all the answers

Which of the following reactions occurs when an acidified solution of KMnO4 is treated with sulfite ion (SO3)?

2 MnO4 + 6H + 5 SO3 → 2 Mn(II) + 5 SO4 + 3 H2O Signup and view all the answers

How does the sulfite ion (SO3) reduce ferric ions (Fe3+) to ferrous ions (Fe2+)?

2 Fe(III) + SO3 + H2O → 2 Fe(II) + SO4 + 2 H+ Signup and view all the answers

What is the reaction that occurs when sulfur dioxide (SO2) gas from sulfites reacts with Ba(OH)2 solution?

SO2 + Ba(OH)2 → BaSO3 (white ppt) Signup and view all the answers

How does the sulfite ion (SO3) decolorize a fuchsin (magenta) solution?

The sulfite ion reduces the fuchsin dye to a colorless compound. Signup and view all the answers

What is the reaction that occurs when a sulfide ion (S2-) is treated with dilute hydrochloric acid (HCl)?

S2- + 2 H+ → H2S Signup and view all the answers

How does the thiocyanate ion (SCN-) react with silver nitrate (AgNO3) solution?

SCN- + AgNO3 → AgSCN (white ppt) Signup and view all the answers

What color does a solution containing FeSO4 in a basic medium change to upon acidification?

Red Signup and view all the answers

In the presence of HCl, what gas may be produced from a reaction involving cyanide ion (CN-)?

Hydrogen cyanide (HCN) Signup and view all the answers

What is the yellow precipitate formed when Arsenate Ion reacts with FeCl3 in Ammonium Acetate solution?

Ferric arsenate Signup and view all the answers

Which of the following solutions does NOT result in a precipitate in a dilute solution according to the text?

BaCl2 solution Signup and view all the answers

What is the color change observed when a solution containing MnCl2 and HCl changes from pink to brown?

Green to red Signup and view all the answers

What color precipitate is formed when AgNO3 reacts with Arsenite Ion in a neutral solution?

Yellow Signup and view all the answers

What does the reaction between 2 cyanide ions (CN-) and ammonium polysulfide form?

(NH4)6SCN Signup and view all the answers

What is the product obtained when Arsenite Ion reacts with Ammonium Molybdate solution and is heated with HNO3?

Arsenate Ion Signup and view all the answers

In Borate Ion reactions, what is the color change observed when Turmeric paper is dipped in HCl solution?

Yellow to Red Signup and view all the answers

Which ion, when reacting with Ferric ion, produces a Red color?

[Fe(CN)6^-3] Signup and view all the answers

What happens when Borate Ion reacts with AgNO3 in a slightly acidic solution?

White precipitate forms Signup and view all the answers

When Arsenite Ion reacts with KI Solution and acid, what is the observed reaction product?

$I_2$ Signup and view all the answers

Which compound is formed when cobalt oxide reacts with borax in the borax bead test?

Co(BO2)2 Signup and view all the answers

Which reagent is used to oxidize bromide ions to free bromine in the bromide ion test?

Potassium permanganate (acidified) Signup and view all the answers

Which reaction occurs when bromide ions are treated with concentrated sulfuric acid and heated?

2HBr + H2SO4 --→ Br2 + SO2 + 2H2O Signup and view all the answers

Which ion interferes with the bromide ion test by reacting with the reducing agent?

Cyanide ion (CN-) Signup and view all the answers

Which reagent is used to detect the presence of carbonate ions by forming a white precipitate that dissolves in excess carbon dioxide?

Lime water Signup and view all the answers

Which statement is true about the reaction between ferric nitrate and bromide ions?

Ferric nitrate does not oxidize bromide ions but oxidizes iodide ions. Signup and view all the answers

Study Notes

Cyanide Ion (CN-)

Reacts with dilute HCl to form HCN gas, which is a deadly poison
Forms a deep blue-green color or precipitate with FeSO4 solution in a basic medium
Forms a red color with Ferric ion (Fe3+) and ammonium polysulfide
Reacts with AgNO3 to form a white precipitate of AgCN, which dissolves in excess cyanide

Ferricyanide Ion [Fe(CN)6-3]

Slowly decomposes in dilute HCl
Reacts with BaCl2 to form no precipitate
Reacts with AgNO3 to form a red solid precipitate of Ag3Fe(CN)6, which may be soluble in saturated NaCl solution
Reacts with MnCl2 and HCl solution to form a pink color that changes to brown

Ferrocyanide Ion [Fe(CN)6-4]

Does not decompose in dilute HCl
Reacts with BaCl2 to form a white precipitate of Ba2Fe(CN)6
Reacts with AgNO3 to form a white precipitate of Ag4Fe(CN)6

Iron Salts

Ferrous ion (Fe2+) gives a dark-blue precipitate of Fe3[Fe(CN)6]2
Ferric ion (Fe3+) gives a brownish to green solution, but no precipitate

Cadmium Salts

Insoluble in acidic solution

Sulfite Ion (SO3)

Oxidizing agents, such as acidified KMnO4 solution, decolorize the solution
Reduces Ferric ions to Ferous ions
Reacts with starch to liberate iodine, which is indicated by a blue color on the paper
Reacts with Ba(OH)2 solution to form a white precipitate of BaSO3

Sulfide Ion (S2)

Reacts with dilute HCl to form an immediate evolution of H2S
Reacts with BaCl2 solution to form no reaction
Reacts with AgNO3 solution to form a black precipitate of Ag2S
Reacts with sodium nitroprusside solution to form a purple color

Thiocyanate Ion (SCN)

Reacts with dilute HCl to form no visible effect
Reacts with AgNO3 to form a white precipitate of AgSCN, which dissolves in excess cyanide ion

Arsenate Ion (AsO4)

Reacts with FeCl3 in ammonium acetate solution to form a yellowish-white precipitate of Fe2(HAsO4)3 or FeAsO4
Reacts with ammonium molybdate solution to form a yellow precipitate

Arsenite Ion (AsO3)

Reacts with dilute HCl to form no visible effect
Reacts with BaCl2 in NH4OH solution to form a white precipitate of Ba3(AsO3)2
Reacts with AgNO3 to form a yellow precipitate of Ag3AsO3
Reacts with H2S to form a yellow precipitate of As2S3

Borate Ion (BO2)

Reacts with dilute HCl to form no visible effect
Reacts with BaCl2 solution to form a white precipitate of Ba(BO2)2
Reacts with AgNO3 solution to form a white precipitate of AgBO2
Reacts with C2H5OH and con'd H2SO4 to form a green flame when ignited

Iodide Ion (I2)

Reacts with dilute HCl to form no visible effect
Reacts with con'd H2SO4 to form a violet color when warmed
Reacts with BaCl2 solution to form no reaction
Reacts with AgNO3 solution to form a yellow precipitate of AgI, which is insoluble in ammonia solution

Nitrate Ion (NO3)

Reacts with dilute HCl to form no visible effect
Reacts with con'd H2SO4 to form a brown gas of NO2
Reacts with BaCl2 solution to form no reaction
Reacts with AgNO3 solution to form no reaction
Reacts with MnCl2 and HCl solution to form a pink color that changes to brown

Bromide Ion (Br2)

Reacts with dilute HCl to form no visible reaction
Reacts with con'd H2SO4 to form a reddish-brown vapor of Br2
Reacts with BaCl2 solution to form no reaction
Reacts with AgNO3 solution to form a pale yellow precipitate of AgBr, which is insoluble in 0.25M NH4OH and in HNO3 but soluble in con'd NH4OH

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Test your knowledge on chemical reactions involving arsenate and arsenite ions. Identify the products formed in various reactions such as with ammonium, molybdate, phosphoric acid, and other reagents.

Chemistry: Arsenate and Arsenite Ion Reactions Quiz

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