Multiple choice questions

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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.

For carbon-carbon bonds, which statement is incorrect?

	The π-component in a C=C bond is less strong than the σ-component
	The two π-components in a C≡C bond are not of equal strength
	A molecule of allene (H₂C=C=CH₂) is constrained to being planar
	Bond strengths along the series C≡C, C=C and C–C follow an inverse relationship to bond lengths

Which statement is incorrect?

	In C₆₀, every C atom is in the same environment and only one ¹³C NMR signal is observed
	Both C₆₀ and C₇₀ consist of fused C₅ and C₆ rings
	C₆₀ adds a carbene to give a fused cyclopropane ring
	C₆₀ is resistant to reduction

Which statement is incorrect?

	Reaction of SiH₄ with K gives a salt of [SiH₃]^–
	Reaction of SiH₃Cl with water vapour gives SiH₃OH as the isolated product
	Reaction of MeC≡CH with KNH₂ releases NH₃
	The acidity of a C–H bond varies with the hybridization of the C atom

Which of the following group 14 cluster anions is incorrectly classified?

	[Pb₅]^2–, closo
	[Ge₁₀]^2–, closo
	[Sn₉]^4–, nido
	[Pb₄]^2–, closo

Which of the following bond enthalpy term orderings is correct?

	Sn–Sn > Ge–Ge > Si–Si
	C–F > C–Cl > C–Br
	C–Cl > Si–Cl > Ge–Cl
	C–O > Si–O > Ge–O

Which of the following is a disproportionation reaction?

	2GeO → GeO₂ + Ge
	2Me₃SiOH → H₂O + Me₃SiOSiMe₃
	Pb₃O₄ + 4HNO₃ → PbO₂ + 2Pb(NO₃)₂ + 2H₂O
	C₆₀ → [C₆₀]^– → [C₆₀]^2–

Match up the correct formula and shape of the central atom. Which pair is correct?

	[CO₃]^2–; trigonal pyramidal
	[SiH₃]^–; trigonal planar
	CS₂; bent
	[CMe₃]⁺; trigonal planar

Which species is linear at the central atom?

	SC₃S
	[F₂SnFSnF₂]^–
	Me₃SiOSiMe₃
	[S₃SnSSnS₃]^6–

Which reaction does not produce CO₂?

	C₂N₂ + O₂ →
	CaCO₃ + HCl →
	HCO₂H treated with conc. H₂SO₄ →
	I₂O₅ + CO →

Which statement about silicates is incorrect?

	Si is 4-coordinate
	Some silicates contain discrete molecular ions
	Talc and mica are examples of silicates with chain structures
	Zeolites are aluminosilicates

For which element is catenation the most important?

	C
	Si
	Ge
	Sn

Which statement is incorrect?

	Cyanogen is a radical
	Sn₃N₄ adopts a spinel-type structure
	Carbon forms a suboxide, C₃O₂
	Zeolites are aluminosilicates

Which statement is incorrect?

	Pb(NO₃)₂ and PbO₂ are both water soluble
	GeO₂ dissolves in basic aqueous solution to give [Ge(OH)₆]^2–
	A C₆₀ molecule has I_h symmetry
	¹¹⁹Sn is an NMR active nucleus

In which reaction does the oxidation state of the group 14 element change?

	Si + 4[OH]^– → [SiO₄]^4– + 2H₂
	GeCl₄ + 2[Et₄N]Cl → [Et₄N]₂[GeCl₆]
	SiCl₄ + 4NH₃ → Si(NH₂)₄ + 4HCl
	SiH₄ + O₂ → SiO₂ + 2H₂O

A low temperature bath for use in the laboratory is required to maintain a temperature of 195 K. You would use:

	solid CO₂ and acetone
	solid CO₂ and ethanol
	liquid N₂
	crushed dry ice

Which one of the following compounds of lead is readily soluble in water?

	Pb(O₂CMe)₂
	PbO
	PbSO₄
	PbI₂

Which of the following orderings gives the correct sequence of bond enthalpy terms for covalent bonds involving group 14 elements?

	C-C > Si-Si > Ge-Ge > Sn-Sn
	C-C < Si-Si > Ge-Ge > Sn-Sn
	C-C < Si-Si < Ge-Ge < Sn-Sn
	C-C > Si-Si < Ge-Ge < Sn-Sn

Which of the following orderings of bond enthalpy terms is correct?

	Si-O > C-O
	Si=O > C=O
	C=O < C=C
	Si-O > Si=O

The standard enthalpy of formation of GeF₄(g) at 298 K is -1169 kJ mol^-1. Determine the average Ge-F bond enthalpy in GeF₄ given that Δ_aH^o for F and Ge = 79 and 375 kJ mol^-1, respectively.

	465 kJ mol^-1
	406 kJ mol^-1
	120 kJ mol^-1
	426 kJ mol^-1

Which of the tin(IV) halides is the strongest halide acceptor?

	SnF₄
	SnCl₄
	SnBr₄
	SnI₄

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