Chemical formula of white ppt. formed in observation (3) is : | TestHub

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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.

Chemical formula of white ppt. formed in observation (3) is :

Options:

Answer:

D

Solution:

Bottles 1, 2, 3, 4 have $Pb (NO_{3})_{2}, HCl, Na_{3} CO_{3}$ and $CuSO_{4}$ .

When mixing :

Bottle $1 +$ Bottle $2 \to PbCl_{2}$

Bottle 1 + Bottle $3 \to PbCO_{2}$

Bottle 1 + Bottle $4 \to PbSO_{4}$

Bottle $2 +$ Bottle $3 \to CO_{2}$

Bottle $2 +$ Bottle $4 \to$ No visible reaction

Bottle 3 + Bottle $4 \to CuCO_{3}$

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

⏱ 2mℹ️ Source: QB

Chemistry - Salt Analysis Question with Solution | TestHub

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