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JEE Advanced

Exam: JEE Advanced
Subject: Chemistry
Chapter: Solid State

JEE Advanced · Chemistry · Solid State

The fourth co-ordination number of Cl^ - ion is CsCl is x whereas...

The fourth co-ordination number of

\mathrm{Cl}^{-}

ion is CsCl is x whereas fourth co-ordination number of

\mathrm{Cl}^{-}

ion in NaCl is

y

. What is the value of

x+y

?

Correct answer

30

Step-by-step solution

CsCl has BCC like structure. The

4^{\text {th }}

co-ordination number of

\mathrm{Cl}^{-}

ion is 24

\therefore x=24

NaCl has FCC structure . The

4^{\text {th }}

co-ordination number of

\mathrm{Cl}^{-}

ion is 6

\begin{aligned} & \therefore y=6 \\ & x+y=24+6=30 \end{aligned}

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