1
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following is not a correct statement for primary aliphatic amines?
A
The intermolecular association in primary amines is less than the intermolecular association in secondary amines.
B
Primary amines on treating with nitrous acid solution from corresponding alcohols except mythyl amine.
C
Primary amines are less basic than the secondary amines.
D
Primary amines can be prepared by the Gabriel phthalimide synthesis.
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :
A
Fe4[Fe(CN)6]3
B
K5Fe[Fe(CN)6]2
C
HFe[Fe(CN)6]
D
KFe[Fe(CN)6]
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :
A
$$Cl\mathop O\limits^ \bullet + \mathop C\limits^ \bullet {F_2}Cl$$
B
$$Cl\mathop O\limits^ \bullet + C\mathop {{H_3}}\limits^ \bullet $$
C
$$\mathop C\limits^ \bullet {H_3} + C\mathop {{F_2}}\limits^ \bullet Cl$$
D
$$\mathop C\limits^ \bullet l + C\mathop {{F_2}}\limits^ \bullet Cl$$
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are :
A
2, 0 and 1
B
0.5, 0 and 2
C
5, 0 and 0.5
D
2, 0 and 0.5
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