1
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is :
A
neutral
B
sometimes positive and sometimes negative
C
positive
D
negative
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II.

List - I List - II
(a) Sucrose (i) $$\beta $$-D-Galactose and $$\beta $$-D-Glucose
(b) Lactose (ii) $$\alpha $$-D-Glucose and $$\beta $$-D-Fructose
(c) Maltose (iii) $$\alpha $$-D-Glucose and $$\alpha $$-D-Glucose

Choose the correct answer from the options given below :
A
(a) $$ \to $$ (iii), (b) $$ \to $$ (ii), (c) $$ \to $$ (i)
B
(a) $$ \to $$ (i), (b) $$ \to $$ (iii), (c) $$ \to $$ (ii)
C
(a) $$ \to $$ (ii), (b) $$ \to $$ (i), (c) $$ \to $$ (iii)
D
(a) $$ \to $$ (iii), (b) $$ \to $$ (i), (c) $$ \to $$ (ii)
3
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?
A
It is also known as Graham's salt.
B
It is polymeric compound and is water soluble.
C
It does not remove Ca2+ ion by precipitation.
D
Calgon contains the 2nd most abundant element by weight in the Earth's crust.
4
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
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