MolSynapsequestion bank

MolSynapse / Question bank / Solid State / Defects in solids

JEE Main levelSingle correct optionDifficulty 2 of 3ss096

Perfect NaCl has density $2.165 g c m^{- 3}$ . If $0.5%$ of the $Na X^{+}$ and $Cl X^{-}$ sites are vacant in equal numbers (Schottky defects) with no change in cell volume, the density in $g c m^{- 3}$ is

A2.154
B2.176
C2.143
D2.165

Answer: A

Mass per cell falls to

99.5%

of the perfect value at the same volume.

ρ = 2.165 \times 0.995 = 2.154 g c m^{- 3}

.

Practice Solid State More on Defects in solids

Previous questionNext question

More questions on Defects in solids

Which of the following defects does not change the density of the crystal? NEET level
The colour of NaCl heated in sodium vapour is due to NEET level
Zinc oxide turns yellow on heating and regains its white colour on cooling. This is because JEE Main level
Which of the following gives an n-type semiconductor? JEE Main level
Which solid among the following can show both Schottky and Frenkel defects? JEE Main level
NaCl is doped with SrCl2 at 1.2x10^-2 mol%. Each Sr^2+ replaces two Na+ ions' worth of charge by creating one cationic vacancy. Using N_A=6.... JEE Main level