1
JEE Main 2026 (Online) 23rd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following statements regarding the energy of the stationary state is true in the following one - electron systems ?

A

$+2.18 \times 10^{-18} \mathrm{~J}$ for second orbit of $\mathrm{He}^{+}$ion

B

$+8.72 \times 10^{-18} \mathrm{~J}$ for first orbit of $\mathrm{He}^{+}$ion

C

$-1.09 \times 10^{-18} \mathrm{~J}$ for second orbit of H atom.

D

$-2.18 \times 10^{-18} \mathrm{~J}$ for third orbit of $\mathrm{Li}^{2+}$ ion

2
JEE Main 2026 (Online) 22nd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The energy of first (lowest) Balmer line of H atom is $x \mathrm{~J}$. The energy (in J) of second Balmer line of H atom is :

A

$\frac{x}{1.35}$

B

$1.35 x$

C

$x^2$

D

$2 x$

3
JEE Main 2026 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is $\_\_\_\_$ $\mathrm{J} \mathrm{mol}^{-1}$.

Given: $R_H=2.18 \times 10^{-11} \mathrm{ergs}$.

A

$9.835 \times 10^{12}$

B

$1.635 \times 10^{-11}$

C

$1.635 \times 10^{-18}$

D

$9.835 \times 10^5$

4
JEE Main 2026 (Online) 21st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider the following spectral lines for atomic hydrogen :

A. First line of Paschen series

B. Second line of Balmer series

C. Third line of Paschen series

D. Fourth line of Bracket series

The correct arrangement of the above lines in ascending order of energy is :

A

D < C < A < B

B

A < B < C < D

C

D < A < C < B

D

C < D < B < A

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