FlexiQuiz - QUIZ 2- ATOM(BOHR'S MODEL)

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1. Rutherford model can't explain the stability of atom. Stability of atom is established by which Bohr,s postulate

Can't say

Postulate 1: The electrons can revolve around the nucleus only in certain stable orbits (stationary states) without the emission of radiant energy.

Postulate 3: The orbiting electron emits energy in the form of electromagnetic waves as it jumps from outer stationary orbit to the inner orbit of lower energy.

Postulate 2: Only those stationary orbits are permissible in which angular momentum of electron is an integral multiple of h/2 (h = planck's constant)

2. If En, Kn and Un are the total energy, kinetic energy and potential energy of an electron in n^th orbit then correct relation will be

Un=-2En,Kn=+En

Un=+2En, Kn=-En

Un=+En,Kn=+2En

Un=-En,Kn=-2En

3. Rutherford model can't explain the line spectrum of Hydrongen atom. Which Bohr's pstulate explain it

Postulate 2: Only those stationary orbits are permissible in which angular momentum of electron is an integral multiple of h/2 (h = planck's constant)

Postulate 3: The orbiting electron emits energy in the form of electromagnetic waves as it jumps from outer stationary orbit to the inner orbit of lower energy.

Postulate 1: The electrons can revolve around the nucleus only in certain stable orbits (stationary states) without the emission of radiant energy.

Can't say

4. Energy of electron in n^th orbit is

inversely proportional to n

inversely proportional to n²

directly proportional ton n

directly proportional to n²

5. Radius of atom is

inversely proportional to n³

directly prportional to n²

directly proportional to n³

inversely proportional to n²

6. Energy of electron in the 2nd energy level of hydrogen atom is

+3.4 eV

-3.4 eV

+3.4 J

-3.4 J

7. Energy of electron in the 2^nd excited state of hydrogen atom

-1.51 eV

-3.4 eV

+3.4eV

+1.51 eV

8. The total energy, kinetic energy and potential energy in the first excited state is

-3.4 eV, -3.4 eV, +6.8 eV

-3.4 eV, +3.4 eV, -6.8 eV

+3.4 eV, +3.4 eV, -6.8 eV

-13.6 eV , +13.6 eV ,-27.2 eV

9. Speed of electron in n^th orbit is

inversely proportional to n²

inversely proprtional to n

directly proportional to n

directly proportional to n²

10. Correct formula for the total energy of an electron in the n^th orbit is

E_n=+13.6/n² eV

E_n=+13.6/n² J

E_n=-13.6/n² J

E_n=-13.6/n² eV

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QUIZ 2- ATOM(BOHR'S MODEL)

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