Solid State Test

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Solid State Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following patterns has void fraction of $$0.26$$?

A
$$AAAA .....$$

B
$$ABABAB ...$$

C
$$ABCABCABC...$$

D
$$ABCCBAABC...$$

Solution

ABCABCABC... patterns has void fraction of 0.26. It corresponds to ccp (cubic close packing) or fcc (face centered cubic) unit cell. Occupied space is 74% and empty space is 26%.
Question 2
1 / -0

Which of the following about the above structure is incorrect?

A
It has $$ccp$$ structure.

B
Each $$X$$ ion is surrounded by eight $$Y$$ ions.

C
The structure is similar to diamond.

D
$$X$$ ions are present at the corner of the cube and center of each face.

Solution

In this type of structure, the coordination number is $$4:4$$ i.e. each $$X$$ atom is surrounded by 4 $$Y$$ atoms and each $$Y$$ atom is surrounded by 4 $$X$$ atoms.
So, option B is not correct.
Question 3
1 / -0

In an ionic compound $$A^{+}X^{-}$$, the radii of $$A^{+}$$ and $$X^{-}$$ ions are 1.0 pm and 2.0pm, respectively. The volume of the unit cell of the crystal AX will be :

A
$$27\ pm^{3}$$

B
$$64\ pm^{3}$$

C
$$125\ pm^{3}$$

D
$$216\ pm^{3}$$
Question 4
1 / -0

The radius of a calcium ion is 94 pm and of the oxide, the ion is 146 pm. The possible crystal structure of calcium oxide will be:-

A
octahedral

B
tetrahedral

C
pyramidal

D
trigonal

Solution
Question 5
1 / -0

In case of cubic system, the number of types of space lattices?

A
3

B
7

C
14

D
12

Solution

There are 14 space lattices are possible in a crystal.
Question 6
1 / -0

How many unit cell of $$NaCl$$ are present in $$7.02\ gm$$ of $$NaCl?$$

A
$$12\times 10^ {-2}N_{A}$$

B
$$3\times 10^ {-2}N_{A}$$

C
$$6\times 10^ {2}N_{A}$$

D
$$1.5\times 10^ {-2}N_{A}$$

Solution
Question 7
1 / -0

What is the number of ions per $$cc$$ in the crystal of $$NaCl$$ at normal temperature?

A
$$10^{6}\ ions$$

B
$$10^{22}\ ions$$

C
$$10^{16}\ ions$$

D
$$10^{8}\ ions$$

Solution

Number of ions per cc in crystal of $$NaCl$$ at normal temperature is $${10}^{22}$$ ions
Question 8
1 / -0

Which of the following have maximum lattice energy :

A
$$LiF$$

B
$$CsCl$$

C
$$KBr$$

D
$$NaCl$$

Solution

$$L.E$$ $$\alpha$$ $$|Z^+||Z^-|$$
$$\alpha$$ $$\dfrac{1}{Size}$$ of ion
So $$LiF$$ should have
Highest $$L.E$$
Question 9
1 / -0

A metallic element crystallizes into a lattice containing a sequence of layers of AB AB AB....Any packing of spheres leaves out voids in the lattice. The empty space in percentage by volume in this lattice is:

A
26%

B
32%

C
20%

D
30%

Solution

AB AB type close packing is actually Hexagonal close packing. In HCP, the space occupied by atoms is 74% and empty space due to voids is 26%.
Question 10
1 / -0

In $$CaF_2$$ lattice coordination number of $$Ca^{+2}$$ & $$F^-$$ is :

A
$$4,4$$

B
$$8, 8$$

C
$$4, 8$$

D
$$8, 4$$

Solution

$$Ca^{+2}$$ occupy at $$FCC$$ lattice site and $$F-$$ occupy at tetrahedral void so $$C.N.$$ of $$Ca^{+2} = 8$$ and $$F- C.N. = 4$$

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Re-Attempt Weekly Quiz Competition

Solid State Test - 19

Result

Solid State Test - 19

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SHARING IS CARING

Question 1

$$AAAA .....$$

$$ABABAB ...$$

$$ABCABCABC...$$

$$ABCCBAABC...$$

Solution

Question 2

It has $$ccp$$ structure.

Each $$X$$ ion is surrounded by eight $$Y$$ ions.

The structure is similar to diamond.

$$X$$ ions are present at the corner of the cube and center of each face.

Solution

Question 3

$$27\ pm^{3}$$

$$64\ pm^{3}$$

$$125\ pm^{3}$$

$$216\ pm^{3}$$

Question 4

octahedral

tetrahedral

pyramidal

trigonal

Solution

Question 5

3

7

14

12

Solution

Question 6

$$12\times 10^ {-2}N_{A}$$

$$3\times 10^ {-2}N_{A}$$

$$6\times 10^ {2}N_{A}$$

$$1.5\times 10^ {-2}N_{A}$$

Solution

Question 7

$$10^{6}\ ions$$

$$10^{22}\ ions$$

$$10^{16}\ ions$$

$$10^{8}\ ions$$

Solution

Question 8

$$LiF$$

$$CsCl$$

$$KBr$$

$$NaCl$$

Solution

Question 9

26%

32%

20%

30%

Solution

Question 10

$$4,4$$

$$8, 8$$

$$4, 8$$

$$8, 4$$

Solution

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