Color of ionic compounds

Question 1

What is the color of following anions
i)F -,Cl -,O -2,S -2,N -3,P -3
ii)MnO4 -,MnO4 -2,CrO4 -2,Cr2O7-2
iii)VO4 -3

Answer 1

i)All are colorless
ii)Purple,Green,Yellow and Orange respectively
iii)Pale Yellow

Question 2

What is the color of
i)d block P-3
ii)ZnS,CdS,HgS,MnS,
iii)BiI3,HgI2,Hg2I2,AgI,PbI2,CuI

Answer 2

i)Black
ii)White,Yellow,Black and pink respectively (generally sulphides are of black color)
iii)Black-brown,Red,Green,Yellow,Yellow and white respectively

Question 3

What is the color of the hydroxide of the following cations:
i)Ni +2
ii)Cu +2
iii)Co+2

Answer 3

i)Green
ii)Blue
iii)Pink

s,p block and d10 cations form white hydroxide

Question 4

What is the color of following compounds
i)KMnO4
ii)K2Cr2O7
iii)Ag3AsO4
iv)Ag3PO4
v)Ag2CO3
vi)Ag2C2O4
vii)CH3COOAg
viii)AgNO2
ix)Ag2SO3

Answer 4

i)Purple
ii)Red-Orange
iii)Red-Brown
iv)Yellow
v)Yellow-White
vi,vii,viii,ix are all white
d1-9 cation form white compounds with p block oxoanions C2O4 -2,NO3 -,NO2 -,CH3COO-,SO4 -2,SO3 -2

Question 5

Al+3,____ and _____ oxides are white

Answer 5

S block,Zn+2