Practice Exercise - 1(Structure Of Atom - JEE Mains)


20 Questions MCQ Test | Practice Exercise - 1(Structure Of Atom - JEE Mains)


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QUESTION: 1

Radiation of λ = 155 nm was irradiated on Li (work function = 5eV) plate. The stopping potential (in eV) is.

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QUESTION: 2

Increasing order of magnetic moment among the following species is __________ .
Na+, Fe+3, Co2+, Cr+2

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QUESTION: 3

If in the hydrogen atom P.E. at ∞ is choosen to be 13.6 eV then the ratio of T.E. to K.E. for 1st orbit of H-atom is __________ .

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QUESTION: 4

The light radiations with discrete quantities of energy are called ___________.

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QUESTION: 5

The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is

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QUESTION: 6

The energy of electron is maximum at :

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QUESTION: 7

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon:

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QUESTION: 8

The third line in Balmer series corresponds to an electronic transition between which Bohr’s orbits in hydrogen :

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QUESTION: 9

The orbital angular momentum of an electron in 2s orbital is :

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QUESTION: 10

Which quantum number is not related with Schrodinger equation :

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QUESTION: 11

The shortest wavelength of He atom in Balmer series is x, then longest wavelength in the Paschene series of Li+2 is :

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QUESTION: 12

An electron in a hydrogen atom in its ground state absrobs energy equal to the ionisation energy of Li+2. The wavelength of the emitted electron is

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QUESTION: 13

An electron, a proton and an alpha particle have kinetic energies of 16E, 4E and E respectively. What is the qualitative order of their de-Broglie wavelengths?

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QUESTION: 14

Given ΔH for the process Li(g) → Li+3 (g) + 3e- is 19800 kJ/mole & IE1 for Li is 520 then IE2 & IE3 of Li+ are respectively (approx, value) :

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QUESTION: 15

The ratio of difference in wavelengths of 1st and 2nd lines of Lyman series in H–like atom to difference in wavelength for 2nd and 3rd lines of same series is :

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QUESTION: 16

If radius of second stationary orbit (in Bohr’s atom) is R. Then radius of third orbit will be

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QUESTION: 17

The ratio of wave length of photon corresponding to the α - line of lyman series in H-atom and β - line of Baimer series in He+ is

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QUESTION: 18

Three energy levels P, Q, R of a certain atom are such that EP < EQ < ER. If λ1, λ2, and λ3, are the wave length of radiation corresponding to transition R → Q : Q → P and R → P respectively. The correct relationship between λ1, λ2 and λ3 is

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QUESTION: 19

The Value of (n2 + n1) and   for He+ ion in atomic spectrum are 4 and 8 respectively. The wavelength of emitted photon when electron jump from n2 to n1 is

 

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QUESTION: 20

Number of possible spectral lines which may be emitted in bracket series in H atom if electrons present 9th  excited level returns to ground level, are

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