JEE Main 2021 (Online) 25th February Evening Shift | Practical Organic Chemistry Question 33 | Chemistry

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 Slot

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

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :

(A), (B) and (C)

(B), (A) and (C)

(C), (A) and (B)

(B), (C) and (A)

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