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PCl5 has a shape of trigonal bipyramid w...

`PCl_5` has a shape of trigonal bipyramid whereas `IF_5` has the shape of a square pyramid. It is due to

A

presence of unshared electron pair on I which is oriented so as to minimise repulsion while P in `PCl_5` , has no unshared pair

B

octet of P is complete while that of I is incomplete

C

P and I are of different groups

D

F and Cl have different extent of repulsion

Text Solution

Verified by Experts

The correct Answer is:
A
Presence of unshared electron pair on I which is oriented so as to minimise repulsion while P in `PCl_5` , has no unshared pair
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Knowledge Check

  • The shape of a molecule is determined by electron-pair repulsions in the valence shell. A lp occupies a larger space than a bp because it is not shared by two nuclei. Thus, the lp-lp repulsion is greater than the lp - bp repulsion, which in turn is greater than the bp - bp repulsion. The presence of lp causes distortion of bond angles, hence, a deviation from an ideal shape. The extent of distortion depends upon the orientation of the Ip's around the central atom. In a trigonal bipyramid, the lp's occupy equatorial positions than the axial ones. In AB type molecules, as the EN of A increases, the bp's come closer and the repulsion between them increases. On the other hand, as EN of B increases, the bp's get farther and repulsion decreases. Which of the following statements is true?

    A
    F-N-F angle in `NF_3` is greater than H-N-H angle in `NH_3` .
    B
    F-N-F angle in `NF_3` is smaller than H-N-H angle in `NH_3`
    C
    H-O-H angle in `H_2O` is greater than H-N-H angle in `NH_3`
    D
    F-O-F angle in `F_2O` is greater than H-N-H angle in `H_2O`

  • A radioactive sample has a half ife of 5 years. Thus for a nucleus in thesample of the element probability of decay in 15 years is

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    The shape of a molecule is determined by electron-pair repulsions in the valence shell. A lp occupies a larger space than a bp because it is not shared by two nuclei. Thus, the lp-lp repulsion is greater than the lp - bp repulsion, which in turn is greater than the bp - bp repulsion. The presence of lp causes distortion of bond angles, hence, a deviation from an ideal shape. The extent of distortion depends upon the orientation of the Ip's around the central atom. In a trigonal bipyramid, the lp's occupy equatorial positions than the axial ones. In AB type molecules, as the EN of A increases, the bp's come closer and the repulsion between them increases. On the other hand, as EN of B increases, the bp's get farther and repulsion decreases. In which of the following molecules is the bond angle largest?

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