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The hydrides of the first elements in gr...

The hydrides of the first elements in group 15-17, namely `NH_(3),H_(2)O and HF` respectively show abnormally high values for melting and boililng points. This is due to-

A

small size of N, O and F

B

the ability to form extensive intermolecular H-bonding

C

the ability to form extensive intramolecular H-bonding

D

effective van der waals interactions.

Text Solution

Verified by Experts

The correct Answer is:
B
The ionisation potential valeus of N, O and F are quite high and thus, they form intermolecular H-bonding to the compound `NH_(3),H_(2)O and HF`. As a result, these compounds show abnormally high values for melting and boiling points.
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Knowledge Check

  • The hydrides of the first elements in group 15-17, namely NH_(3) , H_(2)O and HF respectively show abnormally high values for melting and boiling points. This is due to-

    A
    small size of N, O and F
    B
    the ability to form extensive intermolecular H-bonding
    C
    the ability to form extensive intramolecular H-bonding
    D
    effective van der Waals interaction

  • The hydrides of the elements in groups 15-17 namely NH_3, H_2O and HF respectively show abnormally high values for melting and boiling points. This is due to

    A
    small size of N, O and F
    B
    the ability to form extensive intermolecular H-bonding
    C
    the ability to form extensive intramolecular H- bonding
    D
    effective van der walls interaction

  • Given van der waals constant 'a' of NH_(3),H_(2),O_(2) and CO_(2) are respectively 4.17, 0.244, 1.36 and 3.59. which one of the following gases is most easily liquefied-

    A
    `NH_(3)`
    B
    `H_(2)`
    C
    `O_(2)`
    D
    `CO_(2)`

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