Atomic Structure · Chemistry · WB JEE

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MCQ (Single Correct Answer)

WB JEE 2023
Two base balls (masses : m$$_1$$ = 100 g, and m$$_2$$ = 50 g) are thrown. Both of them move with uniform velocity, but the velocity of m$$_2$$ is 1.5 ...
WB JEE 2022
The number of unpaired electron in Mn2+ ion is
WB JEE 2022
The de-Broglie wavelength ($$\lambda$$) for electron (e), proton (p) and He2+ ion ($$\alpha$$) are in the following order. Speed of e, p and $$\alpha$...
WB JEE 2022
In Bohr model of atom, radius of hydrogen atom in ground state is r1 and radius of He+ ion in ground state is r2. Which of the following is correct?...
WB JEE 2022
Which one of the following is the correct set of four quantum numbers (n, 1, m, s) ?
WB JEE 2021
The atomic masses of helium and neon are 4.0 and 20.0 amu respectively. The value of the de-Broglie wavelength of helium gas at $$-$$73$$^\circ$$C is ...
WB JEE 2020
The maximum number of electrons in an atom in which the last electron filled has the quantum numbers n = 3, l = 2 and m = $$ - $$ 1 is
WB JEE 2020
The radius of the first Bohr orbit of a hydrogen atom is 0.53 $$\times {10^-8}$$ cm. The velocity of the electron in the first Bohr orbit is
WB JEE 2020
The number of unpaired electrons in the uranium (92U) atom is
WB JEE 2020
The difference between orbital angular momentum of an electron in a 4f -orbital and another electron in a 4s-orbital is
WB JEE 2019
Which one of the following electronic arrangements is absurd?
WB JEE 2018
Which of the following electronic configuration is not possible?
WB JEE 2018
The number of unpaired electrons in Ni (atomic number = 28) are
WB JEE 2017
If the given four electronic configurations.(i) n = 4, l = 1(ii) n = 4, l = 0(iii) n = 3, l = 2(iv) n = 3, l = 1are arranged in order of increasing en...
WB JEE 2017
Which of the following sets of quantum numbers represents the 19th electron of Cr(Z = 24) ?
WB JEE 2017
Which one of the following corresponds to a photon of highest energy?

MCQ (More than One Correct Answer)

WB JEE 2023
An electron in the 5d orbital can be represented by the following (n, l, m) values
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