Self-test questions: Chapter 06

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Silicon dioxide forms a covalent structure. Its properties do not include?

High melting point

High boiling point

Good electrical conductivity

Insolubility in water or organic solvents.

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Diamond, graphite and buckminsterfullerene are all

Isotopes of carbon

Allotropes of carbon

conductors

insulators

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In cubic close-packing the coordination number of any hard sphere is?

6

12

9

4

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Which of the following arrangements of layers of spheres is not close-packed?

ABAC

ABAB

ABCABC

ACCA

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How many interstitial tetrahedral sites are there in the unit cell of cubic close-packed?

4

2

8

1

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Devarda's alloy is used as a reductant in analytical chemistry. This compound has a structure where some of the copper atoms in the cubic close packed lattice of copper are replaced by zinc and aluminium. This type of compound is known as?

Interstitial alloy

intermetallic

semiconductor

Substitutional alloy

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What is the coordination numbers of nickel and arsenic in the NiAs structure?

Ni 6, As 6

Ni 6, As 4

Ni 6, As 3

Ni 4, As 4

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What is the correct lattice point count for the 3d structure TiO₂?

Ti (8x⅛) + (1x1) = 2, O (4 x 1) + (2 x ½) = 4

Ti (8x⅛) + (1x1) = 2, O (2 x 1) + (4 x ½) = 4

Ti (4x1/4) + (1x1) = 2, O (4 x 1) + (2 x ½) = 4

Ti (4x1/4) + (1x1) = 2, O (2 x 1) + (4 x ½) = 4

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Put the following ions in increasing order of size; Na⁺, Al³, F^- and N^3-

Na⁺, Al³, F^-, N^3-

Al³,Na⁺, F^-, N^3-

N^3- F^-, Na⁺, Al³⁺,

Al³,Na⁺, N^3-, F^-

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The coordination number of silver in silver bromide is expected to be?

12

8

6

4

Self-test questions: Chapter 06

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