JEE Advanced Chemistry Test 1

Result

JEE Advanced Chemistry Test 1

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is the most likely structure of CrCl₃.6H₂O, if 1/3 of total chlorine of the compound is precipitated by adding AgNO₃ to its aqueous solution?

A
CrCl₃.6H₂O

B
[Cr(H₂O)₃Cl₃](H₂O)₃

C
[CrCl₂(H₂O)₄]Cl.2H₂O

D
[CrCl.(H₂O)₅]Cl₂.H₂O

Solution

[Cr Cl₂ (H₂O)₄] Cl. 2H₂O + AgNO₃ → AgCl ppt
Out of coordination sphere only one chloride ion is present. Ions that is present out of coordination sphere only participate in precipitation.
Question 2
4 / -1

Which of the following is the cause of Brownian movement of colloids?

A
Thermal agitation in medium

B
Collision due to air molecules

C
Unbalanced impacts by molecules of the dispersion medium

D
Cause is unpredictable

Solution

Due to the unbalanced bombardment of the particles by the molecules of the dispersion medium.
Question 3
4 / -1

Which one of the following methods is used to prepare borax crystals?

A
A hot conc. solution of B₂O₃ is made to react with calculated quantity of conc. H₂SO₄

B
Tincal is dried up and heated to red heat

C
Colemanite is powdered, treated with Na2CO3 solution and filtered.

D
An alcoholic solution of boric acid is evaporated and cooled.

Solution

Colemanite is a mineral which is finely powdered and is boiled with Na₂CO₃solution.

Ca₂B₆O₁₁ + 2 Na₂CO₃→ Na₂B₄O₇ + 2 NaBO₂ + 2 CaCO₃↓

During the reaction CaCO3 is precipitated out which is removed by filtration. Then the filtrate is concentrated and cooled to separate the borax crystal. Sodium metaborate present in the mother liquor can be converted into borax by passing a current of carbon dioxide through it.