JEE Main 2019 (Online) 10th January Evening Slot | Solid State Question 49 | Chemistry

A compound of formula A₂B₃ has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :

hcp lattice - A, $${1 \over 3}$$ Tetrahedral voids-B

hcp lattice - B, $${1 \over 3}$$ Tetrahedral voids - A

hcp lattice - A, $${2 \over 3}$$ Tetrahedral voids - B

hcp lattice - B, $${2 \over 3}$$ Tetrahedral voids - A

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which premitive unit cell has unequal edge lengths (a $$ \ne $$ b $$ \ne $$ c) and all axial angles different from 90^o?

Hexagonal

Tetragonal

Triclinic

Monoclinic

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

At 100^oC, copper (Cu) has FCC unit cell structure with cell edge length of x $$\mathop A\limits^o $$. What is the approximate density of Cu (in g cm^$$-$$3) at this temperature?
[Atomic Mass of Cu = 63.55 u]

$${{205} \over {{x^3}}}$$

$${{105} \over {{x^3}}}$$

$${{211} \over {{x^3}}}$$

$${{422} \over {{x^3}}}$$

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which type of ‘defect’ has the presence of cations in the interstitial sites?

Metal deficiency defect

Schottky defect

Vacancy defect