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21.

Among the triatomic  molecules /ions  $BeCl_{2},N^{-}_{3},N_{2}O,N_{2}^{+},O_{3},SCl_{2},ICl_{2},I_{3}^{-}$   and XeF2   , the total number  of linear molecules (s)/ion(s) where the hydridisation  of the central atom does not have contribution from the d-orbitals (s) is [ atomic number of S=16, Cl=17, I=53 and Xe=54]


A) 4

B) 2

C) 1

D) 3



22.

 For the octahedral  complexes of Fe3+ in SCN- (thiocyanate- S) and in CN-  ligand environments, the difference between the spin only magnetic moments  in Bohr magnetons  (when approximated to the nearest  integer) is [ atomic number of Fe=26}


A) 3

B) 4

C) 1

D) 2



23.

The total  number of lone pair of electrons N2O3 is


A) 4

B) 8

C) 5

D) 6



24.

The number of resonance structures for N is

732021152_c3.JPG


A) 5

B) 6

C) 7

D) 9



25.

The total number of stereoisomers that can exist for M is

732021692_c1.JPG


A) 2

B) 1

C) 0



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