Chemistry of transition elements multiple choice questions

Chemistry of Transition Elements

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1 of 26

In which pair of species are the oxidation numbers of the d-block elements the same?

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2 of 26

The electronic configuration of the atoms of an element is 1s²2s²2p⁶3s²3p⁶3d⁵4s¹.

What is the maximum oxidation number shown in compounds of this element?

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3 of 26

Which of the following species will not act as a ligand in the formation of a complex ion?

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4 of 26

Which has the greatest number of unpaired electrons in each of its atoms?

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5 of 26

Which of these complex ions could exist as stereoisomers?

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6 of 26

Chromium is classified as a transition element because

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7 of 26

Copper(II) sulfate solution is blue. This is because

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8 of 26

Platinum forms a complex with the formula Pt(NH₃)₂Cl₂ and chromium forms a complex ion with the formula CrCl₄^-.

Considering the bonding between the central atom and the ligands in these complexes,

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9 of 26

The transition metal complex Pt(NH₃)₂Cl₂ exists as two geometric isomers. This is because the complex

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10 of 26

Copper(II) ions form an aqueous complex ion, X, with chloride ions.

Which statement about X is true?

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11 of 26

What is the number of stereoisomers that Ni(H₂NCH₂CH₂NH₂)₂Cl₂ can form?

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12 of 26

Which is not a correct statement?

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13 of 26

A solution absorbs light with wavelengths corresponding to red, yellow and green light.

Which ion is most likely to be in the solution?

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14 of 26

Which of the following reagents would enable you to separate iron(III) hydroxide from a mixture of iron(III) hydroxide and copper(II) hydroxide?

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15 of 26

The compound 1,2-diaminoethane, H₂NCH₂CH₂NH₂, is a bidentate ligand; in formulae, it is usually abbreviated to ‘en’.

When 1,2-diaminoethane is added to [Co(NH₃)₆]²⁺ in aqueous solution, [Co(en)₃]²⁺ is formed.

What is the best explanation for this?

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16 of 26

The reaction:

[Fe(H₂O)₆]²⁺ + H₂O ➔ [Fe(H₂O)₅(OH)]⁺ + H₃O⁺

is an example of

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17 of 26

Hydrated crystals of a compound have the formula CrCl₃(H₂O)₆.

A solution containing one mole of the compound reacts with two moles of silver nitrate to form two moles of silver chloride.

The complex chromium ion in the compound is most likely to be

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18 of 26

What is the final species produced when an excess of aqueous ammonia is added to aqueous aluminium chloride?

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19 of 26

What does not affect the colour of the complex ion formed by a particular transition metal?

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20 of 26

Which factor does not affect the colour of a complex ion?

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21 of 26

[CoCl₆]^3- is orange while [Co(NH₃)₆]³⁺ is yellow. Which statement is correct?

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22 of 26

Which best explains why transition metal complexes are coloured?

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23 of 26

What is the overall charge, x, of the chromium(III) complex [Cr(H₂O)₄Cl₂]^x?

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24 of 26

What is the overall charge on the iron(III) complex ion [Fe(OH)₂(H₂O)₄]Br

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25 of 26

Which electron configuration is that of a transition metal atom in the ground state?

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26 of 26

What is the coordination number of the nickel(II) ion and the overall charge, m, of this complex?

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