Chapter 13 Multiple Choice Questions

. Is there any difference between boron and the remaining elements from the Group 13?

Yes, boron is non-metallic while all remaining elements are distinctly metallic.

No, there is no difference; all elements are metallic.

No, there is no difference; all elements are non-metallic.

. Boron and silicon in Group 14 have some similar properties. This phenomenon is called:

a diagonal relationship

an intergroup relationship

an interperiodic relationship

. Which statement is incorrect?

Boranes are binary hydrogen compounds of boron.

All boranes are flammable.

Boranes do not undergo hydrolysis reactions.

. Boron halides are:

weak Lewis acids

strong Lewis acids

strong Lewis bases

. The anion of B(OH)₃ in concentrated, neutral or basic solutions:

is a very weak Brønsted-Lowry base

is a very weak Brønsted-Lowry acid

polymerizes by condensation

. Compounds containing B–N bonds are isoelectronic with compounds containing:

C–N bonds

C–C bonds

B–B bonds

. How many skeletal electrons are there in B₅H₉?

18

16

14

. What does the structure of trialkylaluminum compounds depend on:

steric demand of the alkyl groups

solvent used during the synthesis

temperature of the reaction

. The stability of Group 13 monohalides increases with:

increasing Z in the group

decreasing Z in the group

The stability of group 13 monohalides does not change with Z.

. Find the correct statement about GaAs?

GaAs has lower electron mobility and more electronic noise than silicon; GaAs decomposes in moist air.

GaAs has higher electron mobility and less electronic noise than silicon; GaAs decomposes in moist air.

GaAs has higher electron mobility and less electronic noise than silicon; GaAs is stable in moist air.

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