Most crystals show good cleavage because their atoms, ions or mol

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Potassium fluoride has NaCl type structure. What is the distance between K+ and F- ions, if edge length of unit cell is 'a'.

  • a2

  • a4

  • 2a

  • 4a


22.

The flame colours of metal ions are due to

  • Schottky defect

  • Frenkel defect

  • Metal excess defect

  • Metal deficient defect


23.

An alloy of copper, silver and gold is found to have copper atom constituting the ccp lattice. If silver atom occupy the edge centres and gold atom is present at body centred, the alloy has a formula

  • Cu4Ag2Au

  • Cu4Ag4Au

  • Cu4Ag3Au

  • CuAgAu


24.

A metal has bee structure and the edge length of its unit cell is 3.04 A°. The volume of the unit cell in cm3 will be

  • 1.6 × 1021 cm3

  • 2.81 × 10-23 cm3

  • 6.02 × 10-23 cm3

  • 6.6 × 10-24 cm3


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25.

The density of solid argon is 1.65 g per cc at -233°C. If the argon atom is assumed to be a sphere of radius 1.54 × 10-8 cm, what percent of solid argon is apparently empty space? (Ar = 40)

  • 16.5%

  • 38%

  • 50%

  • 62%


26.

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y- ) will be

  • 275.1 pm

  • 322.5 pm

  • 241.5 pm

  • 165.7 pm


27.

Tetragonal crystal system has the following unit cell dimensions

  • a=b=c, α=β=γ=90°

  • a=bc, α=β=γ=90°

  • abc,α=β=γ=120°

  • a=bc,α=β=90°, γ=120°


28.

A crystalline solid

  • changes rapidly from solid to liquid

  • has no definite melting point

  • undergoes deformation of its geometry easily

  • soften easily


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29.

Frenkel defect is generally observed in

  • AgBr

  • Agl

  • ZnS

  • All of the above


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30.

Most crystals show good cleavage because their atoms, ions or molecules are

  • weakly bonded together

  • strongly bonded together

  • spherically symmetrical

  • arranged in planes


D.

arranged in planes

In crystals, the constituents are arranged in orderly pattern, ie, in planes, thus they show good cleavage.


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