AP EAPCET 2025 - 21st May Evening Shift | Solid State Question 9 | Chemistry

An element crystallises in bcc lattice. The atomic radius of the element is $2.598 \mathop {\rm{A}}\limits^{\rm{o}}$. What is the volume (in $\mathrm{cm}^3$ ) of one unit cell?

$6.4 \times 10^{-22}$

$2.16 \times 10^{22}$

$2.16 \times 10^{-22}$

$2.16 \times 10^{-24}$

AP EAPCET 2025 - 21st May Morning Shift

MCQ (Single Correct Answer)

-0

Gold crystallises in fcc lattice. The edge length of the unit cell is $4 \mathop {\rm{A}}\limits^{\rm{o}}$. The closest distance between gold atoms is ' $x$ ' $\mathop {\rm{A}}\limits^{\rm{o}}$ and density of gold is ' $y$ ' $\mathrm{g} \mathrm{cm}^{-3}$. What are $x$ and $y$ respectively?

(Molar mass of gold $=197 \mathrm{~g} \mathrm{~mol}^{-1} ; N=6 \times 10^{23} \mathrm{~mol}^{-1}$ )

$\sqrt{2}, 41.04$

$2 \sqrt{2}, 20.52$

$2 \sqrt{3}, 10.25$

$\sqrt{3}, 5.15$

AP EAPCET 2024 - 23th May Morning Shift

MCQ (Single Correct Answer)

-0

The molecular formula of a cystalline solid $X_3 Y_2$. Atoms of $Y$ form ccp lattice and atoms of $X$ occupy $50 \%$ octachedral voids and $X \%$ of tetrahedral voids. What is the percentage of unoccupied tetrahedral voids?

66.6

33.3

AP EAPCET 2024 - 22th May Evening Shift

MCQ (Single Correct Answer)

-0

A compound is formed by atoms of $A, B$ and $C$. Atoms of $C$ form hcp lattice. Atoms of $A$ occupy $50 \%$ of octahedral voids and atoms of $B$ occupy $2 / 3$ rd of tetrahedral voids. What is the molecular formula of the solid?

$A_3 B_8 C_6$

$A_2 B_8 C_6$

$A B_4 C_3$

$A_5 B_8 C_6$

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