For each confirmation test, select the properties and types of reactions involve

Question

For each confirmation test, select the properties and types of reactions involved in a positive test result. Chloride Ion Confirmation Test Neutralization Solubility Gas forming reaction Precipitation reaction Oxidation/reduction reaction Color change Gas forming reaction Color change Oxidation/reduction reaction Precipitation reaction Solubility Neutralization Oxidation/reduction reaction Solubility Color change Solubility Neutralization Gas forming reaction Oxidation/reduction Gas forming reaction Precipitation reaction Neutralization Color change Solubility Oxidation/reduction reaction Gas forming reaction Color change Precipitation reaction Neutralization Precipitation reaction Neutralization Solubility Color change Gas forming reaction Oxidation/reduction reaction Precipitation reaction Solubility Oxidation reduction reaction Gas forming reaction Neutralization Color change

Explanation / Answer

1) the chloride ion is detected by adding Ag+ salt which will precipitate out the chloride ions as AgCl white ppt which is soluble in ammonia

so answer is precipitation

B) Bromide ion

The initial test it addtion of AgNO3 which will give pale yellow ppt of AgBr

Confirmation test: no change in precipitate on using dilute ammonia solution, readily dissolves in concentrated ammonia solution.

So answer is Precipitation

C) iodide ion gives pale yellow (darker than bromide ion ppt) ppt with AgNO3

for conformation : precipitate is insoluble in ammonia solution of any concentration : so answer is Precipitation

D) Carbonate ions is testd by reaction of acid with salt with brisk efferevesence (evolution of CO2 gas)

CO3-2 + H+ --> H2O + CO2 (g)

the gas turns lime water milky (confirms presence of CO2)

Answer is gas forming reaction

E) oxalate ions are confirmed by reaction with KMnO4 which gets decolourized as KMnO4 gets reduced and turns from pink to colourless. Oxalate ions are oxidized to CO2.

So answer is oxidation / reduction reaction

F )sulphate is confirmed by addtion of barium salt which will give white precipitate of BaSO4

so answer is precipitation

G) confirmatory test of nitrate ion is by addition of dipheylamine which turns the solution colour to blue

Hence answer is change in colour

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