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1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
A
Cryolite
B
Bauxite
C
Calamine
D
Kaolite
2
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

List - I List - II
(a) Haematite (i) $$A{l_2}{O_3}\,.\,x{H_2}O$$
(b) Bauxite (ii) $$F{e_2}{O_3}$$
(c) Magnetite (iii) $$CuC{O_3}\,.\,Cu{(OH)_2}$$
(d) Malachite (iv) $$F{e_3}{O_4}$$


Choose the correct answer from the options given below :
A
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
C
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
D
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates :

JEE Main 2021 (Online) 17th March Morning Shift Chemistry - Isolation of Elements Question 50 English
A
$$\Delta$$G > 0 and decomposition of the metal oxide
B
$$\Delta$$G < 0 and decomposition of the metal oxide
C
$$\Delta$$G = 0 and reduction of the metal oxide
D
$$\Delta$$G = 0 and melting or boiling point of the metal oxide
4
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following reduction reaction CANNOT be carried out with coke?
A
ZnO $$ \to $$ Zn
B
Fe2O3 $$ \to $$ Fe
C
Cu2O $$ \to $$ Cu
D
Al2O3 $$ \to $$ Al
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