Chemistry · 2019
JEE Main · 8 April 2019, Shift 2 · Q52
Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit…
Consider the bcc unit cells of the solids $\displaystyle 1$ and $\displaystyle 2$ with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is $\displaystyle 50$% more in solid $\displaystyle 2$ than in 1. What is the approximate packing efficiency in solid $\displaystyle 2$ ?
Official answer
(1)
$\displaystyle 90$%
More from Solid State
- An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0 g cm^-3. The number of…2022
- An atomic substance A of molar mass 12 g mol^-1 has a cubic crystal structure with edge length of 300 pm. The no. of atoms present in one unit cell…2023
- A compound is formed by two elements X and Y. The element Y forms cubic close packed arrangement and those of element X occupy one third of the…2023
- The number of octahedral voids per lattice site in a lattice is \ \ \ \. (Rounded off to the nearest integer)2021
- Select the correct statements. Crystalline solids have long range order. Crystalline solids are isotropic. Amorphous solids are sometimes called…2021
- Atoms of element X form hcp lattice and those of element Y occupy 2/3 of its tetrahedral voids. The percentage of element X in the lattice is \ \ \…2022
- An element with molar mass 2.7 × 10^-2 kg mol^-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 × 10^3 kg m^-3, the radius of…2020
- The correct relationships between unit cell edge length ' a ' and radius of sphere ' r ' for face-centred and body-centred cubic structures…2023
JEE Main 2019 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.