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Acceptable Colour Changes And Tests For Practical Exam > Transition Metals > Flashcards

Transition Metals Flashcards

1
Q

What colour is aqueous complex Cr3+?

A

Green

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2
Q

What colour is aqueous complex Cr2O7 2-?

A

Orange

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3
Q

What colour is aqueous complex CrO4 2-?

A

Yellow

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4
Q

What colour is aqueous complex Mn2+?

A

Pink

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5
Q

What colour is aqueous complex Fe2+?

A

Green

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6
Q

What colour is aqueous complex Fe3+?

A

Orange/Yellow

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7
Q

What colour is aqueous complex Co2+?

A

Pink

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8
Q

What colour is aqueous complex Ni2+?

A

Green

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9
Q

What colour is aqueous complex Cu2+?

A

Blue

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10
Q

What colour is aqueous complex V2+?

A

Violet

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11
Q

What colour is aqueous complex V3+?

A

Green

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12
Q

What colour is aqueous complex VO2+?
(4+ charge V)

A

Blue

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13
Q

What colour is aqueous complex VO2 +?
(+5 charge V)

A

Yellow

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14
Q

What transition metal ion is soluble in excess NaOH solution. What colour is its precipitate?

A

Cr3+
Green-blue precipitate

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15
Q

What colour is Mn2+ precipitate? Does it change?
Is it soluble? If so what colour is the solution?

A

White precipitate
Slowly turns brown/black on standing.
Insoluble

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16
Q

What colour is Fe2+ precipitate?
Is it soluble? If so what colour is the solution?

A

Green
Insoluble

17
Q

What colour is Fe3+ precipitate?
Is it soluble? If so what colour is the solution?

A

Brown
Insoluble

18
Q

What colour is Co2+ precipitate?
Is it soluble? If so what colour is the solution?

A

Blue precipitate
Soluble in excess ammonia solution
Forms a yellow solution which changes to brown on standing.

19
Q

What colour is Ni2+ precipitate?
Is it soluble? If so what colour is the solution?

A

Green precipitate
Soluble in excess ammonia solution
Forms a blue solution.

20
Q

What colour is Cu2+ precipitate?
Is it soluble? If so what colour is the solution?

A

Blue precipitate
Soluble in excess ammonia solution
Forms a dark blue solution

21
Q

Describe the observations for the reaction of hexaaquacopper(II) ions with ammonia solution, then excess ammonia.

A

Blue precipitate forms
With excess ammonia - dark blue solution forms

22
Q

Describe the observations for the reaction of hexaaquacopper(II) ions with conc. HCl.

A

Blue solution changes to yellow

Acceptable Colour Changes And Tests For Practical Exam (9 decks)

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