Chemistry XII - Solid State 02

Question : 1

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Packing fraction is a bcc structure, is

Options:

Solution :

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Question : 2

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Percentage of empty space in simple cubic unit cell is

Options:

	52.4%
	47.6 %
	32%
	26%

Solution :

%empty space
= 100 – 52.4 = 47.6

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Question : 3

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Volume occupied by the sphere per unit cell in hcp is

Options:

Solution :

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Question : 4

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Total number of axis of symmetry present in a cubic unit cell is

Options:

	9
	10
	13
	23

Solution :

13 axis of symmetry.

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Question : 5

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Mass of unit cell is given by [Z = number of atom per unit cell, M = molar mass]

Options:

Solution :

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Question : 6

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A diagonal plane of symmetry touches or passes through

Options:

	2 diagonally opposite corners + 1 body centre
	4 corners + 1 body centre + 4 edge centres
	4 corners + 1 body centre + 2 face centres + 2 edge centres
	4 corners + 1 body centre + no face centre + 2 edge centres

Solution :

A diagonal plane passes through two diagonally opposite edges

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Question : 7

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Body diagonal of a cubic unit cell is given by, if the edge length is 200 pm

Options:

	282.8 pm
	346.4 pm
	141.4 pm
	173.2 pm

Solution :

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Question : 8

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If an element has fcc structure, then find nearest neighbour distance, if edge length is x pm

Options:

Solution :

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Question : 9

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Find volume of the unit cell in cm³ , having bcc structure of element with density 7 gm/ccand atomic mass 7 is

Options:

	NA x 2

Solution :

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Question : 10

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Maximum packing efficiency is shown by

Options:

	bcc
	fcc
	hcp
	Both (2) & (3)

Solution :

Both fcc and hcp has packing efficiency of 74%.