GATE Overflow for GATE XE - Recent questions and answers in Nature of Bonding in Materials

GATE XE 2026 | Question: 42

Tue, 24 Feb 2026 15:46:34 +0000

The equilibrium vacancy concentration in aluminum at $900$ $\mathrm{K}$ is $1.1 \times 10^{-4}$. The enthalpy of formation of vacancies in $\mathrm{kJ}. \mathrm{mol}^{-1}$ is $\_\_\_\_$ (rounded off to one decimal place).

Given: Universal gas constant $=8.314 \mathrm{~J} \cdot \mathrm{~K}^{-1} \cdot \mathrm{~mol}^{-1}$

GATE XE 2025 | Question: 58

Sun, 04 May 2025 19:07:03 +0000

For a pure element with a $\textsf{BCC}$ crystal structure, the surface energies per unit area of $\{100\}$ and $\{110\}$ free surfaces are $S_{100}$ and $S_{110}$, respectively. The ratio, $\frac{S_{100}}{S_{110}}$, is (rounded off to one decimal place) $\_\_\_\_\_\_$

GATE XE 2022 | Question: 35

Fri, 17 Feb 2023 06:52:11 +0000

Q.45 Match the following materials with their corresponding bonding types.

$\mathrm{P}-4 ; \mathrm{Q}-2 ; \mathrm{R}-3 ; \mathrm{S}-1$
$\mathrm{P}-3 ; \mathrm{Q}-4 ; \mathrm{R}-2 ; \mathrm{S}-1$
$\mathrm{P}-3 ; \mathrm{Q}-2 ; \mathrm{R}-1 ; \mathrm{S}-4$
$\mathrm{P}-3 ; \mathrm{Q}-1 ; \mathrm{R}-4 ; \mathrm{S}-2$