Question

Although co2 and h2o both are triatomic molecule but are co2 is linear and h2o bent shape Why reasons

Answer 1

Answer:

the shape or geometry depends upon the number of sigma bonds and lone pair of electron .[steric number]

Explanation:

in co2 the central atom is c

so steric number is only two and thus hybridization of carbon is sp and as we know the sp have lenear structure

in case of h2o the central atom is oxygen and the oxygen have steric number 4 so the suitable arrangment of lone pair and bond pair  is tetrahedral but shap consider only bonded atomes and there is only two atome attach to central oxygen .the lone pairs repel each other and also bond pair repeled by lone pair and thus the lone pairs donot alow to have lenear goemetry of h2o

Answer 2

★ Answer :

In CO2, there are two C=O bonds. Each C=O bond is a polar bond.

The net dipole moment of C02 molecule is zero. This is possible only if CO2 is a linear molecule. (O=C=O). The bond dipoles of two C=O bonds cancel the moment of each other.

Whereas, H2O molecule has a net dipole moment (1.84 D). H2O molecule has a bent structure because here the O—H bonds are oriented at an angle of 104.5° and do not cancel the bond moments of each other.

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