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AIIMS 2001
Exam
AIIMS
Year
2001
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2001 · Chemistry · d and f Block Elements

Which of the following is the correct sequence of atomic weights of...

Which of the following is the correct sequence of atomic weights of the given elements?

Options

  1. ANi>Co>Fe\mathrm{Ni}>\mathrm{Co}>\mathrm{Fe}
  2. BFe>Co>Ni\mathrm{Fe}>\mathrm{Co}>\mathrm{Ni}
  3. CCo>Fe>Ni\mathrm{Co}>\mathrm{Fe}>\mathrm{Ni}
  4. DCo>Ni>Fe\mathrm{Co}>\mathrm{Ni}>\mathrm{Fe}

Correct answer

D. Co>Ni>Fe\mathrm{Co}>\mathrm{Ni}>\mathrm{Fe}

Step-by-step solution

Fe⁡(Z=26); Atomic weight =55.85Co⁡(Z=27); Atomic weight =58.93Ni(Z=28); Atomic weight =58.69\begin{aligned} \operatorname{Fe}(Z=26) ; \text{ Atomic weight }& =55.85 \\ \operatorname{Co}(Z=27) ; \text{ Atomic weight }& =58.93 \\ \mathrm{Ni}(Z=28) ; \text{ Atomic weight }& =58.69 \end{aligned} The correct order of atomic weights is\mathrm{CO}>>\mathrm{Ni}>>\mathrm{Fe}$
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