A) II A element III A metal
B) III A metal II A element
C) Transition metal in Transition metal in +3 state +2 state
D) II A element Transition metal in +2 state.
Correct Answer: A
Solution :
Spinal is very important red coloured gem stone mineral. The general formula of the spinal is \[\text{A}{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{4}}}\] where, A represents divalent metal ion such as Mg, Fe, Ni, Mn and B represents trivalent metal ion such as Al, Fe, Cr, Ti etc. Generally \[\text{MgA}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{4}}}\] as spinal is mostly occur in nature.
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