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Q.

Which has the highest e/m ratio ?

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a

He²⁺

b

H⁺

c

He⁺

d

D⁺

answer is B.

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Detailed Solution

e/m for ${He}^{+} = 1 / 4$
e/m for ${He}^{2 +} = 2 / 4$
e/m for $D^{+} = 1 / 2$
e/m for $H^{+} = 1 / 1$
$∴$ Value of e/m is highest for H⁺.

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