1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The energy of an electron in the ground state of Hydrogen atom is $$-2.18 \times 10^{-18} \mathrm{~J}$$. What would be the energy associated with the second excited state of $$\mathrm{Li}$$ ?

A
$$ -2.18 \times 10^{-18} \mathrm{~J} $$
B
$$ -4.905 \times 10^{-18} \mathrm{~J} $$
C
$$ -0.242 \times 10^{-18} \mathrm{~J} $$
D
$$ -3.26 \times 10^{-18} \mathrm{~J} $$
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Minimum number of nodes are present in

A
2s
B
3s
C
4s
D
5s
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{O^{2-},F^-,Mg^{2+},Al^{3+},O_2,F_2}$$. How many of the species given above isoelectronic?

A
4
B
2
C
3
D
5
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

The spectrum of He$$^+$$ is similar to

A
H
B
Li$$^+$$
C
Na
D
He$$^+$$
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