Why does crystalline solid show different refractive indices in d… - Vidyadip

Question

Why does crystalline solid show different refractive indices in different directions ?

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Answer

Crystalline solid has long range order of regular pattern of arrangement which repeats periodically over entire crystal.
Within the given pattern, the arrangements of different atoms or ions or molecules is different in different directions. Hence the properties like refractive indices in the different directions are different.

This shows that the crystalline solids are anisotropic in nature.

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Similar questions

(a) Given: $2 NO _{2( g )}+ F _{2( g )} \rightarrow 2 NO _2 F$
Rate $= k \left[ NO _2\right]\left[ F _2\right]$
Hence the reaction is first order with respect to $NO _2$ and first order with respect to $F _2$
$\therefore$ Order of reaction $= n _{ NO 2}+ n _{ F 2}=1+1=2$

(b) Given :
$\begin{aligned}
& CHCl _{3( g )}+ Cl _{2( g )} \rightarrow CCl _{4( g )}+ HCl _{( g ),} \\
& \text { Rate }= k \left[ CHCl _3\right]\left[ Cl _2\right]^{1 / 2}
\end{aligned}$
Hence the reaction is first order in $CHCl _3$ and half order in $Cl _2$.
$\therefore$ Order of reaction
$= n _{ CHCl3 }+ n _{ Cl 2}=1+\frac{1}{2}=\frac{3}{2}$

(a) Order of the reaction $=2$
(b) The order of the reaction $=\frac{3}{2}$

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