Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 1

EASY

AS and A Level

IMPORTANT

Earn 100

Explain why scandium (which forms only one ion, ${Sc}^{2 +}$ ) and zinc (which forms only one ion, ${Zn}^{2 +}$ ) are not called transition elements.

Important Questions on Transition Elements

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 1

Explain why the maximum oxidation state of manganese is

+ 7

.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 1

Determine the oxidation state of Vanadium in

{VO}_{2}^{+}, {VO}^{2 +}, V^{3 +}, V^{2 +}

.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 2

Write two half-equations for the reactions that take place when

{Fe}^{2 +} (aq)

is oxidised by dichromate

(VI)

ions,

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 2

Give the overall reaction of oxidation of

{Fe}^{2 +} (aq)

by dichromate

(VI)

ions by combining its half cell reactions.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 2

Work out the

E^{0}

value of the cell made when the two half-cells shown below are connected and the overall reaction takes place. Discuss and explain what this value predicts about the likelihood of

{Fe}^{2 +} (aq)

) being oxidised by dichromate

(VI)

ions,

\frac{Oxidation : 6 {Fe}^{2 +} (aq) \to 6 {Fe}^{3 +} (aq) + 6 e^{-} Reduction : {Cr}_{2} O_{7}^{2 -} (aq) + 6 e^{-} + 14 H^{+} (aq) \to {Cr}^{3 +} (aq) + 7 H_{2} O (l)}{14 H^{+} (aq) + 6 {Fe}^{2 +} (aq) + {Cr}_{2} O_{7}^{2 -} (aq) \to 6 {Fe}^{3 +} + 2 {Cr}^{3 +} (aq) + 7 H_{2} O (l)}

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 2

How many moles of

{Fe}^{2 +} (aq)

can

1

mole of dichromate

(VI)

oxidise?

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 3

State the oxidation number of the transition element in the compound

{[Cr {(OH)}_{6}]}^{3 -}

.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 24 - Transition Elements>Question>Q 3

Give the formula of a complex formed between

{Ni}^{2 +}

and

{EDTA}^{4 -}

.