Aq NaOH + Transition Metal

Question 1

Cr 3+ - metal aqua ion

Answer 1

Violet solution
Cr(H20)6 3+

Question 2

Fe 2+ - metal aqua ion

Answer 2

Green solution
Fe (H2O)6 2+

Question 3

Fe 3+ - metal aqua ion

Answer 3

Yellow solution
Fe (H2O)6 3+

Question 4

Mn 2+ - metal aqua ion

Answer 4

Pale pink solution
Mn (H2O)6 2+

Question 5

Cu 2+ - metal aqua ion

Answer 5

Blue solution
Cu(H2O)6 2+

Question 6

Co 2+ - metal aqua ion

Answer 6

Pink solution
Co (H2O)6 2+

Question 7

Cr 3+ - with OH-

Answer 7

Green ppt
Cr(OH)3 (H2O)3

Question 8

Fe 2+ - with OH-

Answer 8

Green ppt
Fe (OH)2 (H2O)4

Question 9

Fe 3+ - with OH-

Answer 9

Brown ppt
Fe (OH)3 (H2O)3

Question 10

Mn 2+ - with OH-

Answer 10

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

Question 11

Cu 2+ - with OH-

Answer 11

Blue ppt
Mn (OH)2 (H2O)4

Question 12

Co 2+ - with OH-

Answer 12

Blue ppt
Co (OH)2 (H2O)4

Question 13

Cr3+ - with excess OH-

Answer 13

Green solution
Cr (OH)6 3-

Question 14

Fe 2+ - with excess OH-

Answer 14

No change
Green ppt

Question 15

Fe 3+ - with excess OH-

Answer 15

No change
Brown ppt

Question 16

Mn 2+ - with excess OH-

Answer 16

No change
Pale Brown ppt

Question 17

Cu 2+ - with excess OH-

Answer 17

No change
Blue ppt

Question 18

Co 2+ - with excess OH-

Answer 18

No change
Blue ppt