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1
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The process that involves the removal of sulphur from the ores is :
A
Roasting
B
Smelting
C
Leaching
D
Refining
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Match List - I with List - II.

List - I List - II
(a) Sodium Carbonate (i) Deacon
(b) Titanium (ii) Castner-Kellner
(c) Chlorine (iii) van-Arkel
(d) Sodium hydroxide (iv) Solvay


Choose the correct answer from the options given below :
A
(a) $$ \to $$ (iv), (b) $$ \to $$ (iii), (c) $$ \to $$ (i), (d) $$ \to $$ (ii)
B
(a) $$ \to $$ (iv), (b) $$ \to $$ (i), (c) $$ \to $$ (ii), (d) $$ \to $$ (iii)
C
(a) $$ \to $$ (iii), (b) $$ \to $$ (ii), (c) $$ \to $$ (i), (d) $$ \to $$ (iv)
D
(a) $$ \to $$ (i), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (ii)
3
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Match List - I with List - II.

List - I List - II
(a) Siderite (i) Cu
(b) Calamine (ii) Ca
(c) Malachite (iii) Fe
(d) Cryolite (iv) Al
(v) Zn


Choose the correct answer from the options given below :
A
(a) $$ \to $$ (i), (b) $$ \to $$ (ii), (c) $$ \to $$ (iii), (d) $$ \to $$ (iv)
B
(a) $$ \to $$ (iii), (b) $$ \to $$ (i), (c) $$ \to $$ (v), (d) $$ \to $$ (ii)
C
(a) $$ \to $$ (i), (b) $$ \to $$ (ii), (c) $$ \to $$ (v), (d) $$ \to $$ (iii)
D
(a) $$ \to $$ (iii), (b) $$ \to $$ (v), (c) $$ \to $$ (i), (d) $$ \to $$ (iv)
4
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.
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