Q.

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

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a

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

b

‘A’ is true but ‘R’ is false

c

Both 'A' and 'R' are false

d

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

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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