Which of the following statements are correct postulates of VSEPR theory?

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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.

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

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

answer is A.

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Detailed Solution

Lewis concept is unable to explain the shapes of molecules. Sidgwick and Powell in 1940, proposed a simple theory to explain.the shape of the molecules based on the repulsive interactions of the electron pairs in the valence shell of the atoms. It was further developed and redefined by Nyholm and Gillespie (1957). The theory was called VSEPR [Valence Shell Electron Pair Repulsion] theory. All are the postulates of VSEPR theory.

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