Multiple choice questions

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Chapter 28: Some aspects of solid state chemistry

For some of these questions, you need data from the appendices of Inorganic Chemistry, third edition by C.E. Housecroft and A.G. Sharpe. On opening the book cover you will find a periodic table and a list of elements and atomic masses. Physical constants are listed on the back inside cover of the book.

Multiple choice questions by Catherine E. Housecroft.

This activity contains 20 questions.

A Schottky defect may involve all but one of the following. Which one is incorrect?

	A vacant cation and a vacant anion in an MX lattice
	Vacant cation:anion sites in a ratio 1:2 in an MX₂ lattice
	Vacant cation and vacant anion sites in a ratio 2:1 in an M₂X lattice
	Random vacancies in any lattice

Which statement is incorrect?

	FeO is always O deficient
	UO₂ tends to have an anion-excess lattice
	TiO is non-stoichiometric
	In a metal deficient M²⁺O^2– lattice, some metal sites contain M³⁺ ions

Which is the best electrical conductor at 298 K?

	TiO
	MnO
	CoO
	NiO

Which superconductor has the highest value of T_c (critical temperature)?

	NbTi
	Nb₃Sn
	K₃C₆₀
	YBa₂Cu₃O₇

Band gaps affect semiconducting properties. Which is the correct ordering of band gaps in these III-V semiconductors?

	GaSb < InSb
	GaP > GaAs
	InAs > InP
	GaP < Si

Thin films of GaAs deposited by CVD are best made by which of the following reactions at appropriate temperatures?

	Ga + As
	GaH₃ + AsH₃
	GaMe₃ + AsH₃
	GaPh₃ + AsH₃

Which statement is incorrect about semiconductors?

	A charge carrier may be either a positive hole or an electron
	Ga-doped Si is a p-type semiconductor
	n- and p-type semiconductors are intrinsic semiconductors
	Doping Si with As introduces a donor level below the conduction band

GaAs_xP_1–x is used in light emitting diodes (LEDs). When x = 0.10 and x = 0.65, the wavelengths of the emitted light are 780 and 630 nm respectively. These correspond to emissions which are:

	x = 0.10, red; x = 0.65, green
	x = 0.10, red; x = 0.65, orange
	x = 0.10, infrared; x = 0.65, green
	x = 0.10, infrared; x = 0.65, orange

Metal films deposited from organometallic precursors by CVD are often contaminated with carbon. Why are ethyl derivatives less likely than methyl derivatives to give significant carbon content in a thin film?

	C₂H₆ is more volatile than CH₄
	A C₂H₅ group contains a β-H atom
	C₂H₅ groups readily combine to give C₄H₁₀
	α-H abstraction from the C₂H₅ group occurs

Many ceramic materials consist of metal oxides or silicates with additives that give white or coloured pigments. Which combination of pigment and colour is incorrect?

	TiO₂; white
	Cr₂O₃; green
	cobalt oxides-based pigments; blue
	SnO₂; yellow

Examples of superconducting materials with T_c > 35 K include all but one of the following. Which is the odd one out?

	NbTi
	MgB₂
	Cs₃C₆₀
	YBa₂Cu₃O₇

Two alkali metal nitrides M₃N have been structurally characterized and one is an M⁺ion conductor. Which statement is correct?

	Li₃N and Na₃N have been structurally characterized; Li₃N has a layer structure and is an Li⁺ ion conductor
	Li₃N and Na₃N have been structurally characterized; Na₃N has a layer structure and is an Na⁺ ion conductor
	Na₃N and K₃N have been structurally characterized; Na₃N has a layer structure and is an Na⁺ ion conductor
	Li₃N and K₃N have been structurally characterized; Li₃N has a layer structure and is an Li⁺ ion conductor

Doping NiO with Li₂O in the presence of O₂:

	results in replacement of Ni²⁺ by Li⁺, and Ni²⁺ oxidation to Ni³⁺ to preserve electrical neutrality
	creates vacancies in the lattice
	results in a change in structure-type because the stoichiometry of the system changes
	results in replacement of Ni²⁺ by Li⁺, and creation of O^2– vacancies to preserve electrical neutrality

Thin films of TiC are:

	used for wear-resistant coatings
	semiconducting
	used in solar cells
	phosphorescent

Which of the following pairings is incorrect?

	UO₂; anion-deficient structure
	AgBr; Frenkel defect
	TiO; non-stoichiometric solid
	CaTiO₃; perovskite

The best general description of a Chevrel phase is that it comprises a:

	a ternary molybdenum chalcogenide
	a binary molybdenum chalcogenide
	a molybdenum sulfide
	a ternary or binary tungsten chalcogenide

To be classed as ''nanoscale'', an object must have one dimension that is of the order of:

	10^-10 m
	10^-12 m
	10^-9 m
	10^-15 m

A graphene sheet differs from the framework of a fullerene because:

	the graphene sheet consists of C_n rings in which n = 5 and 6, but in a fullerene n = 5
	the graphene sheet consists of C_n rings in which n = 6, but in some fullerenes n = 5
	the graphene sheet consists of C_n rings in which n = 6, but in fullerenes n = 5 and 6
	the graphene sheet consists of C_n rings in which n = 5 or 6, but in most fullerenes n = 6

Nanotubes usually form in bundles. Which is the best description of such a bundle?

	The tubes are connected together by covalent C-C bonds
	The tubes are randomly organized, with the axes of the tubes lying in random directions
	The tubes are aligned, axes parallel, with van der Waals forces operating between adjacent tubes
	The bundles are of discrete sizes, and dipole-dipole forces hold the tubes together

α-AgI is an ion conductor. Which statement is correct?

	The Ag⁺ ions form a rigid lattice through which I^- ions can migrate
	The Ag⁺ ions randomly occupy tetrahedral holes in a bcc arrangement of I^- ions
	Ag⁺ ions move between octahedral holes in an fcc lattice of I^- ions
	I^- ions randomly occupy octahedral holes in a ccp lattice of Ag⁺ ions

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