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Explain why melting point of NaCl is hig...

Explain why melting point of `NaCl` is higher than that of `AlCl_(3)`.

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Melting point of `NaCl` is higher than that of `AlCl_(3)` because of strong electrostatic forces between oppositely charged ions. On the other hand, `AlCl_(3)` is a covalent compound with lesser forces of attraction.
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Knowledge Check

  • The melting point of copper is higher than that of zinc because

    A
    copper has a bcc structure
    B
    the atomic volume of copper is higher
    C
    the J-electrons of copper are involved in metallic bonding
    D
    the s as well as J-electrons of copper are involved in metallic bonding.

  • The melting point of copper is higher than that of zinc because

    A
    the s, p as well as d- electrons of copper are involved in metallic bonding.
    B
    the atomic volume of copper is higher
    C
    the d - electrons of copper are involved in metallic bonding
    D
    the s as well as d- electrons of copper are involved in metallic bonding.

  • The melting point of RbBr is 682^(@)C , while that of NaF is 988^(@)C . The principla reason that melting point of NaF is much higher than that of RbBr is that :

    A
    the two crystal are not isomorphous
    B
    the molar mass of `NaF` is smaller thean that of `RbBr`
    C
    the internuclear distance `r_(c)+r_(a)` is greater for `RbBr` than for `NaF`.
    D
    the bond in `RbBr` has more covalent character than the bond in `NaF`.

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    Explain the following: The boiling point of bromoethane is higher than that of chloroethane.

    Explain why the melting point of a substance gives an indication of the purity of a substance.

    Explain why silicon shows a higher covalency than carbon.

    Explain why silicon shows a higher covalency than carbon.

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