Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: Solid State

NTA Abhyas 2020 · Chemistry · Solid State

The number of unit cells in 58.5g of NaCl is approximately

The number of unit cells in

\text{58}\text{.5}\text{g}

of

NaCl

is approximately

Options

A $6 \times 1{0}^{20}$
B $1.5 \times 1{0}^{23}$
C $6 \times 1{0}^{23}$
D $0.5 \times 1{0}^{24}$

Correct answer

B. $1.5 \times 1{0}^{23}$

Step-by-step solution

\text{58}\text{.5}\text{g}NaCl = 6 \times 1{0}^{23}

molecule (atoms)

of NaCl

(as

NaCl

occupies FCC system)
1-unit cell have 4 molecules of

NaCl

So, no. of unit cell

= \dfrac{6 \times 1{0}^{23}}{4} = 1.5 \times 1{0}^{23}

Practice Solid State on Quantrex Academy →

More from Solid State

The density (in g cm^ -3 ) of the metal which forms a cubic close packed (ccp) lattice… JEE Advanced 2025 Atoms of metals x, y and z form face-centred cubic (fcc) unit cell of edge length L _ x… JEE Advanced 2023 Which of the following expressions is correct in case of a CsCl unit cell (edge length… JEE Main 2023 Sodium metal crystallises in a body centred cubic lattice with unit cell edge length of… JEE Main 2023 An atomic substance A of molar mass 12g mol ^ – 1 has a cubic crystal structure with edge… JEE Main 2023 The correct relationships between unit cell edge length ‘ a ’ and radius of… JEE Main 2023 Number of crystal systems from the following where body centred unit cell can be found… JEE Main 2023 A compound is formed by two elements X and Y . The element Y forms cubic close packed… JEE Main 2023 Full Solid State list All NTA Abhyas JEE Main PYQs