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1
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.
2
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Match List - I with List - II.

List - I (Ore) List - II (Element Present)
(a) Kernite (i) Tin
(b) Cassiterite (ii) Boron
(c) Calamine (iii) Fluorine
(d) Cryolite (iv) Zinc


Choose the most appropriate answer from the options given below :
A
(a) $$ \to $$ (i), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (ii)
B
(a) $$ \to $$ (iii), (b) $$ \to $$ (i), (c) $$ \to $$ (ii), (d) $$ \to $$ (iv)
C
(a) $$ \to $$ (ii), (b) $$ \to $$ (i), (c) $$ \to $$ (iv), (d) $$ \to $$ (iii)
D
(a) $$ \to $$ (ii), (b) $$ \to $$ (iv), (c) $$ \to $$ (i), (d) $$ \to $$ (iii)
3
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The major components of German Silver are :
A
Zn, Ni and Ag
B
Cu, Zn and Ni
C
Cu, Zn and Ag
D
Ge, Cu and Ag
4
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The method used for the purification of Indium is :
A
zone refining
B
vapour phase refining
C
liquation
D
van Arkel method
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