The crystal system of a compound with unit cell dimensions ,

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 Multiple Choice QuestionsMultiple Choice Questions

191.

A mineral having the formula AB2 crystallizes in the cubic close-packed lattice , with the A atoms occupying the lattice points. The fraction of the tetrahedral sites occupied by B atoms is :

  • 20 %

  • 40 %

  • 60 %

  • 100 %


192.

A forms hcp lattice and B are occupying 1/3rd of tetrahedral voids, then the formula of compound is

  • AB

  • A3B2

  • A2B3

  • AB4


193.

Which of the following is an amorphous solid?

  • Iron

  • Graphite

  • Diamond

  • Glass


194.

The Ca2+ and F- are located in CaF2 crystal respectively at face-centred cubic lattice points and in

  • tetrahedral voids

  • half of tetrahedral voids

  • octahedral voids

  • half of octahedral voids


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195.

 Assertion: Monoclinic sulphur is an example of monoclinic crystal system.

 Reason: For a monoclinic system, a c and a=γ = 90°, β90°.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


196.

In bcc structure contribution of comer and central atom is

  • 18,1

  • 14,18

  • 18,12

  • 1,12


197.

Which defect causes decrease in the density of crystal ?

  • Frenkel

  • Schottky

  • Interstitial

  • F-centre


198.

CsCl has bcc arrangement. Its unit cell edge length is 400 pm. Its inter-ionic distance is

  • 400 pm

  • 800 pm

  • 3 ×100 pm

  • 32×400 pm


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199.

The crystal system of a compound with unit cell dimensions , a = 0.387 , b = 0.387 and c = 0.504 run and αβ = 90° and γ = 120° is :

  • cubic

  • hexagonal

  • orthorhombic

  • rhombohedral


B.

hexagonal

Given , a = b ± c and αβ = 90° , γ = 120°

Hence , the crystal system is hexagonal .


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200.

Tincture of iodine is :

  • aqueous solution of I2

  • solution of I2 in aqueous KI

  • alcoholic solution of I2

  • aqueous solution of KI


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