(A) : Hydrogen has only one electron in its orbit but produces several spectral lines.
(R) : There are many excited energy levels available in a sample of Hydrogen gas.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is true but ‘R’ is false

Both 'A' and 'R' are false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

answer is A.

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Detailed Solution

Only one electron is present in H-atom and produce H-spectrum has several lines,
Each line in H-spectrum indicates various electronic transitions. The sample of Hydrogen gas contains large number of H-atoms in which the electrons get excited to different excited states and get deexcited to grand state in different ways. Thus H-spectrum has several spectral lines Statement II explains Statement I.

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