Q35 / 200 · Manipal (MET) 2010 · Chemistry

Which has the highest $e / m$ ratio?

  • A
    $\mathrm{He}^{2+}$
  • Correct answer
    B
    $\mathrm{H}^{+}$
  • C
    $\mathrm{He}^{+}$
  • D
    $\mathrm{D}^{+}$

Solution

$e / m$ ratio for $\mathrm{He}^{2+}=\frac{2}{4}$ $e / m$ ratio for $\mathrm{H}^{+}=\frac{1}{1}$ $e / m$ ratio for $\mathrm{He}^{+}=\frac{1}{4}$ $e / m$ ratio for $\mathrm{D}^{+}=\frac{1}{2}$ $\therefore$ The $e / m$ is highest for hydrogen.

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

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