Statement -1: As r + r - increase coordination number is also increases Statement -2: When r + r - = 1 the co-ordination number tend to 12 .

Statement-1 is True, Statement-2 is True; Statement-2 NOT a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is False.

Statement -1 is False, statement-2 is True.

Statement -1: As r + r - increase coordination number is also increases Statement -2: When r + r - = 1 the co-ordination number tend to 12 .

Statement-1 is True, Statement-2 is True; Statement-2 NOT a correct explanation for Statement-1.

EASY

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Statement -1: As $\frac{r_{+}}{r_{-}}$ increase coordination number is also increases

Statement -2: When $\frac{r_{+}}{r_{-}} = 1$ the co-ordination number tend to $12$ .

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Important Questions on Solid State

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

What are the coordination numbers (C.N.) of

{Ca}^{2 +}

and

F^{-}

ion in calcium fluoride

({CaF}_{2})

crystal structure ?

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

What is the value of radius ratio of ionic crystal having coordination number six?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

If the edge length of a body centred unit cell is

400 pm,

what will be the approximate radius of the atom present in it? (in pm)

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

In a compound, atoms of element

Y

form

ccp

lattice and those of element

X

occupy

\frac{2}{3}

of tetrahedral voids. The formula of the compound will be

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

What is the co-ordination number of

{Cl}^{-}

NaCl

crystal ?

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

The arrangement of X^- ions around A⁺ ion in solid AX is given in the figure (not drawn to scale). If the radius of X^- is 250 pm, the radius of A⁺ is

Question Image

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

The radius of

K^{+}

133 pm

and that of

{Cl}^{-}

181 pm

. The volume of the unit cell of

KCl

expressed in

10^{- 22} {cm}^{3}

is:

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

ZnS

crystal,

{Zn}^{2 +}

ions occupy _____ void.

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

Ionic radii of cation

A^{+}

and anion

B^{-}

are

102

and

181 pm

respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for

B^{-} . A^{+}

is present in all octahedral voids. The edge length of the unit cell of the crystal

AB

is___

pm

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

Number of unit cells present in a cubic shaped ideal crystal of

NaCl

of mass

1.00 g

is [Molecular mass

= 58.5

]

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

The fraction of voids occupied in the inverse spinel compounds are

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

An ionic compound is formed between a metal M and non-metal

Y.

M

occupies half the octahedral voids in the cubic close - packed arrangement formed by

Y,

the chemical formula of the ionic compound is

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

A compound of formula

A_{2} B_{3}

has the HCP lattice. Which atom forms the HCP lattice and what fraction of the tetrahedral voids are occupied by the other atoms?

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

CsCl

crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct?

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

The ionic radii of

A^{+}

and

B^{-}

ions are

0.98 \times 10^{- 10} m

and

1.81 \times 10^{- 10} m

. The coordination number of each ion in AB is

Statement -1: As r+r- increase coordination number is also increases Statement -2: When r+r-=1 the co-ordination number tend to 12.

Important Questions on Solid State

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Statement -1: As $\frac{r_{+}}{r_{-}}$ increase coordination number is also increases

Statement -2: When $\frac{r_{+}}{r_{-}} = 1$ the co-ordination number tend to $12$ .