COLOURS Flashcards by thiyara dhanapala

Q

Cr3+ metal aqua ion

A

violet
[Cr(H2O)6]3+

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Q

Fe2+ metal aqua ion

A

green
[Fe(H2O)6]2+

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Q

Fe3+ metal aqua ion

A

yellow
[Fe(H2O)6]3+

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Q

Mn2+ metal aqua ion

A

pale pink
[Mn(H2O)6]2+

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Q

Cu2+ metal aqua ion

A

blue
[Cu(H2O)6]2+

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Q

Cr3+ with aqueous sodium hydroxide

A

green ppt
Cr(OH)3(H2O)3

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Q

Cr3+ with aqueous ammonia

A

green ppt
Cr(OH)3(H2O)3

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Q

Fe2+ with aqueous sodium hydroxide

A

green ppt
Fe(OH)2(H2O)4

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Q

Fe3+ with aqueous ammonia

A

brown ppt
Fe(OH)3(H2O)3

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Q

Mn2+ with aqueous ammonia

A

pale brown ppt
Mn(OH)2(H2O)4

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Q

Cu2+ with aqueous ammonia

A

blue ppt
Cu(OH)2(H2O)4

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Q

Cr3+ with excess ammonia

A

purple solution
[Cr(NH3)6]3+

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Q

Fe2+ with excess ammonia

A

no change

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Q

Fe3+ with excess ammonia

A

no change

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Q

Mn2+ with excess ammonia

A

no change

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Q

Cu2+ with excess ammonia

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A

dark blue solution
[Cu(NH3)4(H2O)2]2+

Q

Fe2+ with aqueous ammonia

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A

green ppt
Fe(OH)2(H2O)4

Q

Fe3+ with aqueous sodium hydroxide

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A

brown ppt
Fe(OH)3(H2O)3

Q

Mn2+ with aqueous sodium hydroxide

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A

pale brown ppt
Mn(OH)2(H2O)4

Q

Cu2+ with aqueous sodium hydroxide

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A

blue ppt
Cu(OH)2(H2O)4

Q

Cr3+ with excess sodium hydroxide

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A

green solution
[Cr(OH)6]3-

Q

Fe2+ with excess sodium hydroxide

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A

no change

Q

Fe3+ with excess sodium hydroxide

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A

no change

Q

Mn2+ with excess sodium hydroxide

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A

no change

Cu2+ with excess sodium hydroxide

no change

Cu2+ with excess HCl

yellow solution CuCl4 2-

Cu2+ reduced with I-

white precipitate of CuI/ Cu+ brown solution of I2

disproportionation of Cu+

brown solid of Cu blue solution of Cu2+

CoCl4 2-

blue solution

Cr2O7 2-

orange solution

CrO4 2-

yellow solution

MnO4 -

purple solution

Cl2 in aqueous sol

pale green

Br2 in aqueous sol

yellow

I2 in aqueous sol

brown

Cl2 in organic sol

colourless

Br2 in organic sol

yellow

I2 in organic sol

purple