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In a H-like sample electrons make transition from 4th excited state to 2nd state then

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10 different spectral lines are observed

6 different spectral lines are observed

number of lines belonging to the balmer series is 3

Number of lines belonging to paschen series is 2.

answer is B, C, D.

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Detailed Solution

Transition is taking place from $5 \to 2$

$\Rightarrow$ $Δ n = 3$
Hence maximum number of spectral line observed = $\frac{3 (3 + 1)}{2} = 6$

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