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In general the melting and boiling point...

In general the melting and boiling points of transition metals

A

increases gradually across the period from left to right

B

decreases gradually across the period from left to right

C

first increases till the middle of the period and then decreases towards the end

D

First decreases regulary till the middle of the period and then increases towards the end.

Text Solution

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The correct Answer is:
c
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Knowledge Check

  • The melting points and the boiling points of the transitions elements are higher than the corresponding s-block elements. This is because

    A
    Transition metals have smaller size
    B
    Of the presence of one or more unpaired electrons contribution to higher inter atomic forces on account of covalent bond
    C
    of strong metalic bond due to small size and higher ionization energy
    D
    of the presence of vacant d-orbitals

  • Assertion: The melting and boiling points of the alkali metals are low. Reason: Alkali metals have weak metalli bonding.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • The decrease in melting and boiling points of alkali metals with rise in atomic number is due to

    A
    the weakening covalent bonding
    B
    weak ionic bonding
    C
    van der Waal's forces
    D
    the weakening of the metallic bonding.

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