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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2019 · 26 May · Chemistry · d and f Block Elements

Which of the following transition elements have melting point below...

Which of the following transition elements have melting point below 500∘C500^{\circ} \mathrm{C} ?

Options

  1. AAg,Cu\mathrm{Ag}, \mathrm{Cu}
  2. BZn,Cd\mathrm{Zn}, \mathrm{Cd}
  3. CCd,Cu\mathrm{Cd}, \mathrm{Cu}
  4. DAg,Zn\mathrm{Ag}, \mathrm{Zn}

Correct answer

B. Zn,Cd\mathrm{Zn}, \mathrm{Cd}

Step-by-step solution

Zn\mathrm{Zn}\left(419.5^{\circ} \mathrm{C}\right), \mathrm{Cd}(321∘C)\left(321^{\circ} \mathrm{C}\right) have very low melting point due to low heat of atomisation and weak metallic bonding. Melting points of Ag\mathrm{Ag} and Cu\mathrm{Cu} are 961∘C961^{\circ} \mathrm{C} and 1084∘C1084^{\circ} \mathrm{C} respectively.
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