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Which of the following is/are main postulates of VSEPR theory?

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There exists stationary cubical arrangement of the octet about central atom.

Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.

Valence shell is taken as a sphere with the electron pairs localizing on the spherical surface at maximum distance from one another.

This model is applicable to any resonance structure that represents a molecule.

answer is A, B, D.

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Detailed Solution

NCERT (Part-I) Page No. 113.

• The shape of a molecule depends upon the number of valence shell electron pairs (bonded or nonbonded) around the central atom.

• Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.

• These pairs of electrons tend to occupy such positions in space that minimise repulsion and thus maximise distance between them.

• The valence shell is taken as a sphere with the electron pairs localising on the spherical surface at maximum distance from one another.

• A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single super pair.

• Where two or more resonance structures can represent a molecule, the VSEPR model is applicable to any such structure.

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