Grp 3 Fe³+

Question 1

Fe³+ + NaOH mention colour too

Answer 1

Fe(OH)3 (brown)

Question 2

Is Fe(OH)3 soluble in NaOH or NH4OH?

Answer 2

No

Question 3

Fe³+ H2S mention colour too

Answer 3

Fe²+ + S(white ppt) + H+

Question 4

Fe³+ + (NH4)2S mention colour too

Answer 4

FeS (black ppt) + S(white ppt)

Question 5

Fe³+ 3CN‐ mention colour too

Answer 5

Fe(CN)3 (reddish brown)

Question 6

Fe(CN)3 excess KCN mention colour too

Answer 6

K4[Fe(CN)6] (yellow solution)

Question 7

Fe³+ + [Fe(CN)6]⁴‐ mention colour too

Answer 7

Fe4[Fe(CN)6]3 (prussian blue ppt)

Question 8

Fe4[Fe(CN)6]3 + NaOH

Answer 8

Fe(OH)3 + [Fe(CN)6]⁴-

Question 9

Fe²+ + K4[Fe(CN)6]⁴- mention colour too

Answer 9

K2Fe[Fe(CN)6] (white ppt)

Question 10

[Fe(CN)6]³- + Fe³+ mention colour too

Answer 10

Fe[Fe(CN)6] (brown)

Question 11

Fe[Fe(CN)6] + SnCl2 or H2O2 mention colour too

Answer 11

Fe4[Fe(CN)6]3 (prussian blue)

Question 12

Fe²+ + (Fe(CN)6)³- mention colour too

Answer 12

Fe4(Fe(CN)6)3 (turnbulls blue)

Question 13

Fe³+ + SCN‐ mention colour too1

Answer 13

Fe(SCN)3 (red colouration)

Question 14

Is Fe(SCN)3 soluble in water?

Answer 14

Its soluble but undissociated

Question 15

Fe(SCN)3 + 6F- mention colour too

Answer 15

[FeF6]³-(colourless)+ SCN-

Question 16

CH3COONa + Fe³+ water mention colour too

Answer 16

[Fe3(OH)2(CH3COO)6]+ (reddish brown)

Question 17

What forms when the above complex is heated

Answer 17

Fe(OH)2CH3COO(reddish brown) + acetic acid