Q31 / 160 · TS EAMCET 2022 (18 Jul Shift 2) · Chemistry

Assertion: In general, transition metals have high melting points.

Reason: More number of electrons from 'n-1d' and 'ns' are involved in interatomic metallic bonding.

The correct option among the following is

  • Correct answer
    A
    Assertion is true, Reason is true and Reason is the correct explanation for Assertion
  • B
    Assertion is true, Reason is true but Reason is not the correct explanation for Assertion
  • C
    Assertion is true but Reason is false
  • D
    Assertion is false but Reason is true

Solution

The transition metals (with the exception of Zn, Cd and Hg) are very much hard and have low volatility. Their melting and boiling points are high.The high melting points of these metals are attributed to the involvement of greater number of electrons from  (n-1)d in addition to the ns electrons in the interatomic metallic bonding. In any row the melting points of these metals rise to a maximum at d5.

Hence, the correct answer is option: 'A'.

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