1
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

List - I
Test/Reagents/Observation(s)
List - II
Species detected
(a) Lassaigne's Test (i) Carbon
(b) Cu(II) oxide (ii) Sulphur
(c) Silver nitrate (iii) N, S, P, and halogen
(d) The sodium fusion extract
gives black precipitate with
acetic acid and lead acetate
(iv) Halogen Specifically


The correct match is :
A
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
B
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
C
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
D
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.
A
ketoses, proteins
B
proteins, ketoses
C
aldoses, ketoses
D
ketoses, aldoses
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following is 'a' FALSE statement ?
A
Carius method is used for the estimation of nitrogen in an organic compound.
B
Kjeldahl's method is used for the estimation of nitrogen in an organic compound.
C
Carius tube is used in the estimation of sulphur in an organic compound.
D
Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7 by adding magnesia mixture.
4
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-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 :
A
Statement I is false but Statement II is true.
B
Statement I is true but Statement II is false.
C
Both Statement I and Statement II are false.
D
Both Statement I and Statement II are true.
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