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What is the relation between diamond and graphite?

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Important Questions on Solid State

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 number of anionsnumber of cations in Z is _____.
EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Glass is
EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Which of the following is NOT true about the amorphous solids?
MEDIUM
Chemistry>Physical Chemistry>Solid State>Classification of Solids
The radius of K+ is 133 pm and that of Cl- is 181 pm. The volume of the unit cell of KCl expressed in 10-22 cm3 is:
HARD
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Define Anisotropy. Distinguish between crystalline solids and amorphous solids.
EASY
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
EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Which of the following statements is true with regards to crystalline solids?
EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with:-
MEDIUM
Chemistry>Physical Chemistry>Solid State>Classification of Solids
The material that soften on heating to finally flow like a liquid is _____.
MEDIUM
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Give two differences between Crystalline solids and Amorphous solids.
EASY
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?
MEDIUM
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.

MEDIUM
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 32 times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is
EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion Ca2+ and fluoride ion F- are
HARD
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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EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids

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

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EASY
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Among the following, which have highest melting point?
HARD
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Which of the following statement is correct?
MEDIUM
Chemistry>Physical Chemistry>Solid State>Classification of Solids
What is a vitreous state ?
MEDIUM
Chemistry>Physical Chemistry>Solid State>Classification of Solids
Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solid are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of
temperatures.
(E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.