JEE Main 2021 (Online) 26th February Morning Shift | Practical Organic Chemistry Question 32 | Chemistry

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

On treating a compound with warm dil. H₂SO₄, gas X is evolved which turns K₂Cr₂O₇ paper acidified with dil. H₂SO₄ to a green compound Y. X and Y respectively are :

X = SO₂, Y = Cr₂O₃

X = SO₃, Y = Cr₂(SO₄)₃

X = SO₃, Y = Cr₂O₃

X = SO₂, Y = Cr₂(SO₄)₃

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I : The identification of Ni²⁺ is carried out by dimethyl glyoxime in the presence of NH₄OH.

Statement II : The dimethyl glyoxime is a bidentate neutral ligand.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is false but Statement II is true.

Statement I is true but Statement II is false.

Both Statement I and Statement II are false.

Both Statement I and Statement II are true.

JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63^oC while the other boils at 60^oC What is the best way to separate the two liquids and which one will be distilled out first ?

fractional distillation, 3-methylpentane

simple distillation, 3-methylpentane

fractional distillation, isohexane

simple distillation, isohexane

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