TG EAPCET 2024 (Online) 9th May Morning Shift | Solid State Question 5 | Chemistry

The molecular formula of a compound is $A B_2 \mathrm{O}_4$. Atoms of $O$ form ccp lattice. Atoms of $A$ (cation) occupy $\frac{1}{8}$ th of tetrahedral voids. Atoms of $B$ (cation) occupy a fraction of octahedral voids. What is the fraction of vacant octahedral voids?

$\frac{3}{4}$

$\frac{1}{4}$

$\frac{1}{3}$

$\frac{1}{2}$

TS EAMCET 2023 (Online) 12th May Evening Shift

MCQ (Single Correct Answer)

-0

Identify the crystal system in which primitive unit cell has edge lengths $a=b=200 \mathrm{pm}$ and $c=300 \mathrm{pm}$ and all axial angles are same

tetragonal

rhombohedral

monoclinic

cubic

TS EAMCET 2023 (Online) 12th May Morning Shift

MCQ (Single Correct Answer)

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Assertion (A) Graphite is used as a dry lubricant in machines which run at high temperatures.

Reason ( $\mathbf{R}$ ) The layers of graphite slip one over the other when pressure is applied.

The correct option among the following is

(A) is true but (R) is false

(A) is false but $(R)$ is true

$(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$

(A) and (R) are true, but $(R)$ is not the correct explanation of $(A)$

TS EAMCET 2023 (Online) 12th May Morning Shift

MCQ (Single Correct Answer)

-0

At $T(\mathrm{~K})$, copper (atomic mass $=63.5 \mathrm{u}$ ) has fce structure with an edge length of $x \AA$. The density of copper (in $\mathrm{g} \mathrm{cm}^{-3}$ ) at that temperature approximately is $\left(N_A=6.0 \times 10^{23} \mathrm{~mol}^{-1}\right)$

$\frac{423}{x}$

$\frac{4.23}{x^3}$

$\frac{423}{x^3}$

$\frac{212.5}{x^3}$

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