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NCERT Class XI Chemistry Solutions

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Question : 4 of 40
Marks: +1, -0
Draw the Lewis structures for the following molecules and ions :
H2S,SiCl4,BeF2,CO32−,HCOOH\mathrm{H_2S}, \mathrm{SiCl_4}, \mathrm{BeF_2}, \mathrm{CO_3^{2-}}, \mathrm{HCOOH}.
Solution:  
Lewis structures :
H2S\mathrm{H_2S} → H:S....H\mathrm{H}:\overset{\text{..}}{\underset{\text{..}}{\mathrm{S}}}\mathrm{H}
SiCl4\mathrm{SiCl_4} → :Cl....:Si:Cl:....:Cl:....:Cl....::\overset{\text{..}}{\underset{\text{..}}{\mathrm{Cl}}}:\overset{\text{..}}{\overset{:\mathrm{Cl}}{\mathrm{Si}}\underset{\text{..}}{:}}\underset{\overset{\text{..}}{\underset{\text{..}}{:\mathrm{Cl}:}}}{}:\overset{\text{..}}{\underset{\text{..}}{\mathrm{Cl}}}:
BeF2\mathrm{BeF_2} → :F....:Be. F....::\overset{\text{..}}{\underset{\text{..}}{\mathrm{F}}}:\mathrm{Be}.\:\overset{\text{..}}{\underset{\text{..}}{\mathrm{F}}}:
CO32−\mathrm{CO_3^{2-}} → [:O....:C..:O..::O....:]2−\left[:\overset{\text{..}}{\underset{\text{..}}{\mathrm{O}}}:\overset{:\underset{\text{..}}{\mathrm{O}}}{\overset{\text{..}}{\mathrm{C}}}::\overset{\text{..}}{\underset{\text{..}}{\mathrm{O}}}:\right]^{2-}
HCOOH\mathrm{HCOOH} → H:C..:O..::O....:H\mathrm{H}:\overset{:\underset{\text{..}}{\mathrm{O}}}{\overset{\text{..}}{\mathrm{C}}}::\overset{\text{..}}{\underset{\text{..}}{\mathrm{O}}}:\mathrm{H}
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