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Write the composition of Pyrex glass.

Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

Which of the following is NOT true about the amorphous solids?

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

HARD

Chemistry>Physical Chemistry>Solid State>Classification of Solids

Define Anisotropy. Distinguish between crystalline solids and amorphous solids.

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

The barrier potential of a p-n junction depends on:

(a)

type of semi-conductor material

(b)

amount of doping

(c)

temperature
Which one of the following is correct?

HARD

Chemistry>Physical Chemistry>Solid State>Classification of Solids

Consider an ionic solid

MX

, with

NaCl

structure. Construct a new structure

(Z)

, whose unit cell is constructed from the unit cell of

MX

, following the sequential instructions given below. Neglect the charge balance.

(i)

Remove all the anions

(X)

, except the central one.

(ii)

Replace all the face centered cations

(M)

, by anions

(X)

(iii)

Remove all the corner cations

(M)

(iv)

Replace the central anion

(X)

, with cation

(M)

.

The value of

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

In the following circuit diagram, the current through the battery is

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

The material that soften on heating to finally flow like a liquid is _____.

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

Give two differences between Crystalline solids and Amorphous solids.

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

The cubic unit cell structure of a compound containing cation $M$ and anion $X$ is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

Given below are two statements. One is labelled as
Assertion $A$ and the other is labelled as Reason $R$ .
Assertion $A :$ Sharp glass edge becomes smooth on heating it up to its melting point.

Reason $R :$ The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.

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Chemistry>Physical Chemistry>Solid State>Classification of Solids

An intrinsic semiconductor is converted into