(A) : In hydrogen atom the energy order is 1s < 2s = 2p < 3s
(R) : In hydrogen inter electronic repulsions are absent

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

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

‘A’ is true but ‘R’ is false

Both 'A' and 'R' are false

answer is A.

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Detailed Solution

In hydrogen inter electronic repulsions are absent due to the presence of single electron. Hence the order of energy based on 'n' value only.

As n value increases energy of orbital increases. If n value is same then energy is also same.

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