1
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
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]
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
$$\mathop C\limits^ \bullet l + C\mathop {{F_2}}\limits^ \bullet Cl$$
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
A
X = basic Y = amphoteric
B
X = amphoteric Y = basic
C
X = acidic Y = acidic
D
X = basic Y = basic
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