Self-test questions: Chapter 27

.

Which of the following oxidation states is commonly formed by the group 15 elements when the element is ionised?

+2

+4

-2

+3

.

In the p block, why does the ionic character of the oxide increase as the group is descended?

The orbitals are more easily hybridised as the group is descended.

The difference in electronegativity between the oxide and the element decreases.

The difference in electronegativity between the oxide and the element increases.

The orbitals are less easily hybridised as the group is descended

.

In acid solution, aluminium reacts with water to form what species?

[Al(H₂O)₆]³⁺ and H₂

[Al(H₂O)₆]³⁺

[Al(OH)₄]^- and H₂

[Al(OH)₄]^-

.

BN is isoelectronic with CC and as a result boron nitride can form similar compounds with similar properties to carbon. Which one of these statements is untrue in relation to BN?

BN can crystallises with a layer structure

The layer structure of BN consists of hexagonal rings

In BN structures, BN are ordered so they are alternating within the structures.

The graphite like structure of BN conducts electricity.

.

Germanium can be described as a

metalloid?

non-metal?

metal?

gas?

.

Which of the following facts is untrue about phosphorus?

P₄O₁₀ reacts with water to produce phosphoric acid, H₃PO₄

Burning phosphorus in air produces P₄O₆ and P₄O₁₀

Although phosphorus exists as three allotropes, phosphorus only occurs naturally as black phosphorus

Phosphorus can be extracted from phosphate minerals such as apatite.

.

Which one of the following species does not exist?

SCl₆

SF₆

SO₂Cl₂

SO₄^2-

.

The name of HClO₂ is?

Hypochloric acid

Chlorous acid

Perchloric acid

Hypochlorous acid

.

The shape of the interhalogen anion, ClF₄^-, as predicted by VSEPR theory is?

Square planar

tetrahedral

square based pyramidal

disphenoidal

.

Which group 18 gas is used to date mineralogical samples that are more than 100,000 years old?

Ne

Ar

Xe

Kr

Self-test questions: Chapter 27

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