Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
A,B and D have 8:8 coordination..MnO belongs to rocksalt family 6:6 coordination
https://youtu.be/EZ3U0HERmC0 check this video
you have to learn the type of crystals means to categorise...simple cubic,fcc or bcc then only you decide coordination