This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The parameters of the unit cell of a substance are a = 2.5, b = 3.0, c = 4.0, $$\alpha$$ = 90$$^\circ$$, $$\beta$$ = 120$$^\circ$$, $$\gamma$$ = 90$$^\circ$$. The crystal system of the substance is :
A
Hexagonal
B
Orthorhombic
C
Monoclinic
D
Triclinic
2
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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.
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an :
A
Covalent solid
B
Molecular solid
C
Ionic solid
D
Metallic solid
4
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is :
A
M2A3
B
M4A3
C
M4A
D
MA3
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