Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 43

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The energy gap $(Eg)$ between valence band and conduction band for diamond, silicon and germanium are in the order

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Important Questions on States of Matter: Solid State

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 44

Which of the following compound is metallic and ferromagnetic ?

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 45

For which crystal anion-anion contact is valid ?

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 46

Each rubidium halide crystallising in the

NaCl

type lattice has a unit cell length

0 \cdot 30 A °

greater than for corresponding potassium salt

(r_{K^{+}} = 1 \cdot 33 A °)

of the same halogen. Hence, ionic radius of

{Rb}^{+}

is

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 47

For a solid with the adjoining structure, the coordination number of the points $A$ and $B$ respectively are

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 48

If the positions of

{Na}^{+}

and

{Cl}^{-}

are interchanged in

NaCl

, having

fcc

arrangement of

{Cl}^{-}

ions then in the unit cell of

NaCl

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 49

Which of the following statements is not correct?

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 50

KCl

crystallises in the same type of lattice as does

NaCl

. Given that

r_{{Na}^{+}} / r_{{Cl}^{-}} = 0.55

and

r_{K^{+}} / r_{{Cl}^{-}} = 0.74

. Calculate the ratio of the side of the unit cell of

KCl

to that of

NaCl

.

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Pradeep's Chemistry Vol 1>Chapter 6 - States of Matter: Solid State>Competition Focus>Q 51

Which has no rotation of symmetry ?