Among the compounds Fe3O4, NiFe2O4 and Mn3O4
A. NiFe2O4 and Mn3O4 are normal spinels
B. Fe3O4 and Mn3O4 are normal spinels
C. Fe3O4 and Mn3O4 are inverse spinels
D. Fe3O4 and NiFe2O4 are inverse spinels
Answer: Option D
A. NiFe2O4 and Mn3O4 are normal spinels
B. Fe3O4 and Mn3O4 are normal spinels
C. Fe3O4 and Mn3O4 are inverse spinels
D. Fe3O4 and NiFe2O4 are inverse spinels
Answer: Option D
Which of the following species has two non-bonded electron pairs on the central atom?
A. TeCI4
B. CIF3
C. lCl2
D. PCl3
The spinels CoFe2O4 and FeFe2O4 respectively are
A. inverse and inverse
B. inverse and normal
C. normal and normal
D. normal and inverse
The arrangement of sulphur in zinc blende and wurtzite structures, respectively are
A. hexagonal close packing and cubic close packing
B. cubic close packing and hexagonal close packing
C. simple cubic packing in both the structures
D. hexagonal dose packing in both the structures
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