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Chemistry - Salt Analysis Question with Solution | TestHub

ChemistrySalt AnalysisTEST OF CATIONS Dry Test, Group Analysis, Group 1,2Medium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

There are 4 glass bottles containing water solutions. These bottles are not labelled. Bottles 1, 2 and 3 contained colourless solutions, while Bottle 4 contained a coloured solution. Each Bottle is having any solution among the following (Each bottle is having different solution) :

Copper (II) sulphate

Sodium carbonates

Lead nitrate

Hydrochloric acid

By mixing samples of the contents of the bottles in pairs, following observations are made.

(1) Bottle 1 + Bottle 2 White ppt.

(2) Bottle 1 + Bottle 3 White ppt.

(3) Bottle 1 + Bottle 4 White ppt.

(4) Bottle 2 + Bottle 3 Colourless gas evolved

(5) Bottle 2 + Bottle 4 No visible reaction

(6) Bottle 3 + Bottle 4 Blue ppt.

Aqueous solution in bottle 4 is reacted with excess of KI and then $Na_{2} S_{2} O_{3}$ solution is added to it. Which of the following statement is incorrect.

Options:

Answer:

Solution:

$CuSO_{4} + KI \to Cu_{2} I_{2} ↓ + I_{2}$

white

$I_{2} + Na_{2} S_{2} O_{3} \to Na_{2} S_{4} O_{6} + NaI$

reduced oxidised

Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF CATIONS Dry Test, Group Analysis, Group 1,2

⏱ 2mℹ️ Source: QB

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