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Standard XII

Chemistry

Zeff

The density o...

Question

The density of CaO is 3.35 gm/cm³. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca⁺⁺ ions and O^-2 ions belong to each unit cell, and which type of cubic system is present?

CsCl structure

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Rock salt Structure

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Zinc blend structure

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Fluorite structure

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Solution

The correct option is B
Rock salt Structure

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Similar questions

Q. The density of

C a O

3.35

/ c m^{3}

. The oxide crystallizes in one of the cubic systems with an edge of

4.80 o A

. How many

C a^{2 +}

ions belong to each unit cell?

[C a O = 56]

Q. Ferrous oxide has a cubic structure and the edge length of its unit cell is

5.0 A^{\circ}

. Assuming the density of ferrous oxide to be

3.84 {g/cm}^{3}

, the number of

F e^{2 +}

and

O^{2 -}

ions present in each unit cell should be:

(use N_{A} = 6 \times 10^{23})

Q. Pyrite,

F e S_{2}

crystallises in a cubic unit cell with a cell edge of 0.54 nm. The density of pyrite is

5.02 g / c m^{3}

. How many

F e^{2 +}

and

S_{2}^{2 -}

ions are present in a single unit cell?
(S = 32, Fe =56u)

Q. If the length of body diagonal for

CsCl

, which crystallises into a cubic structure with

{Cl}^{-}

ions at the corners and

{Cs}^{+}

ions at the centre of unit cell is

7 ˚ A

and the radius of

{Cs}^{+}

ion is

1.69 ˚ A

. The radius of

{Cl}^{-}

ion?

Q. Iron

(II)

oxide crystallise in cubic structure with unit cell edge length of

5 A^{\circ}

. If the density of oxide is

3.8 {g cm}^{- 3}

. Calculate the number of

F e^{2 +}

ions present in each unit cell.
[ Molar mass of

F e = 56 g/mol

]

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The density of CaO is 3.35 gm/cm3. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca++ ions and O-2 ions belong to each unit cell, and which type of cubic system is present?

The correct option is B Rock salt Structure

The density of CaO is 3.35 gm/cm³. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca⁺⁺ ions and O^-2 ions belong to each unit cell, and which type of cubic system is present?

The correct option is B
Rock salt Structure