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Assertion (A): Alkali metals are soft an...

Assertion (A): Alkali metals are soft and have low Melting and boiling points.
Reason (R): This is because interatomic bonds are weak.

A

Both (A) and (R) are not true

B

(A) is true but (R) is not correct explanation of (A)

C

(A) is not true but (R) is true

D

Both (A) and (R) are true and (R) is correct explanation of (A)

Text Solution

Verified by Experts

The correct Answer is:
(a)
Alkali metals are soft and have low melting and boiling points due to their weak inter atomic bonds.
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Knowledge Check

  • (A): Alkali metals are not soft and have low melting and boiling points (R): This is because interatomic bonds are weak

    A
    Both A and R are correct and R is the correct explanation of A.
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    A is True but R is False
    D
    R is True but A is False.

  • Alkali metals are soft and have low melting point and boiling point due to

    A
    Inter atomic bonds are weak
    B
    Inter atomic bonds are strong
    C
    Low ionisation potential
    D
    Smaller atomic size

  • (A) : Alkali metals are very soft and they can be cut with knife (R) : Alkali metals have weak interatomic forces

    A
    Both A and R are correct and R is the correct explanation of A .
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    A is True but R is False
    D
    R is True but A is False .

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    Which compounds exhibit low melting and boiling points?

    Noble gases have very low boiling points. Why ?

    (A) Noble gas elements have very low melting and boiling points (R) The interatomic attractions in noble gas elements are weak dispersion forces.

    The reason for the noble gases to have low boiling and low melting point is

    Assertion (A) Helium has lowest boiling point (4.2 K). Reason (R ) The forces that exist between helium atoms are weak disperson forces.

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