D Block Oxides

Question 1

True or false
All the metals except Sc form MO oxides which are covalent.

Answer 1

False. They are all ionic

Question 2

True or false
The highest OS coincides with the period no till Fe

Answer 2

False - The highest OS coincides with the group no till Mn

Question 3

True or false
As the Os of metal increases, the covalent character decreases

Answer 3

False - As the Os of metal increases, the covalent character increases or ionic character decreases.

Question 4

True or False
CrO3 and V2O5 are basic and have higher MP

Answer 4

False - CrO3 and V2O5 are acidic and have lower MP
Acidic only because of higher OS but V2O5 is amphoteric

Question 5

Salts of V2O5
Salts of V2O4
Salts of V2O5 with alkalies and acids

Answer 5

VO4³- + VO2+
VO²+
VO4³- and VO4+

Question 6

Covalent green oil

Answer 6

Mn2O7

Question 7

Amphoteric oxides of d block

Answer 7

TiO2
VO2, V2O3
CrO2, Cr2O3
MnO2, Mn2O3, Mn3O4
CuO
ZnO

Question 8

Acidic oxides of d block

Answer 8

CrO3, Mn2O7