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JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements. One is labelled as Assertion A nd the other is labelled as Reason R.

Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point.

Reason R : The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.
A
A is true but R is false
B
Both A and R are true but R is NOT the correct explanation of A.
C
A is false but R is true.
D
Both A and R are true and R is the correct explanation of A.
2
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H2SO4. Also Compound 'X' gives precipitate 'Y', when its solution in dilute HCl is treated with H2S gas. The precipitate 'Y' on treatment with concentrated HNO3 followed by excess of NH4OH further gives deep blue coloured solution, Compound 'X' is :
A
Co(NO3)2
B
Pb(NO2)2
C
Cu(NO3)2
D
Pb(NO3)2
3
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The metal that can be purified economically by fractional distillation method is :
A
Fe
B
Zn
C
Cu
D
Ni
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

List - I List - II
(a) Mercury (i) Vapour phase refining
(b) Copper (ii) Distillation refining
(c) Silicon (iii) Electrolytic refining
(d) Nickel (iv) Zone refining


Choose the most appropriate answer from the option given below :
A
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
B
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
C
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
D
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
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