TG EAPCET 2024 (Online) 10th May Morning Shift | Solid State Question 3 | Chemistry

An element with molar mass $2.7 \times 10^{-2} \mathrm{~kg} \mathrm{~mol}^{-1}$ forms a cubic unit cell with edge length of 405 pm . If its density is $2.7 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$, the number of atoms present in one unit cell of it is (Given; $N_A=6.023 \times 10^{23} \mathrm{~mol}^{-1}$ )

TG EAPCET 2024 (Online) 9th May Evening Shift

MCQ (Single Correct Answer)

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Identify the correct statement about the crystal defects in solids.

Frenkel defect is favoured when the difference between sizes of cation and anion is very small.

Frenkel defect is not a dislocation effect.

Schotthy defects have no effect on physical properties of solids.

Trapping of electrons in lattice leads to the formation of F-centres.

TG EAPCET 2024 (Online) 9th May Morning Shift

MCQ (Single Correct Answer)

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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 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 $(A)$

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