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Which of the following is correct regarding diad axis of symmetry?

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Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
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>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Which of the following is NOT true about the amorphous solids?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion Ca2+ and fluoride ion F- are
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
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
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Define Anisotropy. Distinguish between crystalline solids and amorphous solids.
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
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?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
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 _____.
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)

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

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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
The material that soften on heating to finally flow like a liquid is _____.
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Give two differences between Crystalline solids and Amorphous solids.
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)

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>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)

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>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with:-
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
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:
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Among the following, which have highest melting point?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Which among the following is NOT a polar molecular solid ?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Silicon doped with gallium forms
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Which of the following statement is correct?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Which of the following statements is true with regards to crystalline solids?
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Chemistry>Physical Chemistry>Solid State>Some Basic Terms Used For Crystal (Interfacial Angle, Solid Angle, Face, Edge, Corner)
Glass is