Home
Class 11
CHEMISTRY
Which of the following is cprrect regard...

Which of the following is cprrect regarding Bohr's theory?
(i) Elecrtronic energy is quantized.
(ii) Bohr showed the physical meaning of the two whole numbers `n` and `m` in the Balmer-Rydeberg equation.
(iii) Electrons can only be in certain discrete orbits.
(iv) Electrons absorb or emit enegry in discrete amounts as they more form one orbit to anothe.

A

`(i),(ii),(iii),(iv)`

B

`(i),(ii),(iii)`

C

`(ii),(iii),(iv)`

D

`(i),(ii),(iii),(iv)`

Text Solution

Verified by Experts

The correct Answer is:
D
(i) Only certain values of electronic enegry are possible.
(ii) The whole numbers `n` and `m` represent the two enegry states between which the transition takes place.
(iii) The radius `(r )` of the circular orbit proportional to `n^(2)`.
(iv) Bohr's application of the idea of quantization of energy to the electron in an atom provided the answer to the puzzle concerning the discrete colors given off in the spectrum.
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    R SHARMA|Exercise Follow-up Test 2|1 Videos

  • STRUCTURE OF ATOM

    R SHARMA|Exercise Follow-up Test 3|1 Videos

  • STRUCTURE OF ATOM

    R SHARMA|Exercise Follow-up Test 1|1 Videos

  • STATES OF MATTER

    R SHARMA|Exercise ARCHIVES|41 Videos

  • THE P BLOCK ELEMENTS

    R SHARMA|Exercise Archives|40 Videos

Similar Questions

Explore conceptually related problems

Which of the following statement is true regarding Bohr's model of hydrogen atom ? (I) Orbiting speed of electrons decreases as if falls to discrete orbits away from the nuclues. (II) Radii of allowed orbits of electrons are proportional to the principle quantum number. (III) Frequency with which electrons orbit around the nucleus in discrete orbits is inversely proportional to the principle quantum number. (IV) Binding froce with which the elctron is bound to the nuclues increases as it shifts to outer orbits. Selected the correct answer using the codes given below:

Which of the following is correct? (i) The energy of an electron in an H atom has a negative sign for all possible orbits. (ii) The enegry of an electron in the atom is lower than the enegry of a free electron at rest. (iii) A free electron at rest is an electron that is infinitely far away form the nucleus and is assigned the enegry value of zero. (iv) As the electron gets closer to the nucleus (as n decreases), E_(n) becomes larger in absolute value and more and more negative.

Which of the following options is correct regarding True (T) or False(F) nature of the statements. Statement - 1 : Angular momentum quantum number determines the three dimensional shape of the orbital . Statement-2 : No two orbitals can have exactly same wave function . Statement - 3 : The principal quantum number determines the orientation and energy of the orbital . Statement - 4 : The orbital wave function of one electron species which obeys Pauli's exclusion priniciple will be dependent on all the four quantum numbers .

Which of the following statement(s) is//are consistent with the Bohr theory of the atom (and no other)? (1) An electron can remain in a particular orbit as long as it continuously absorbs radioation of a definite frequency. (2) The lowest energy orbits are those closest to the nucleus. (3) All electrons can jump from the K shell to the M shell by emitting radiation of a definite frequency.

Which of the following quantum number for orbitals in hydrogen atom has a greater energy of electrons ? (i) n=3,l=2 and m_(l) +1 (ii) n= 3 , l=2 and m_(l) = -1

One of the fundamental laws of physics is that matter is most stable with the lowest possible energy. Thus, the electron in a hydrogen atom usually moves in the n=1 orbit, the orbit in which it has the lowest energy. When the electon is in this lowest energy orbit, the atom is said to be in its ground electronic state. If the atom receives energy from an outside source, it is possible for the electron to move ot an orbit with a higher n value, in which case the atoms is in an excited state with a higher energy. The law of conservation of energy says that we cannot create or destroy energy. Thus, if a certain amount of external energy is required to excite an electron from one energy level to another, then that same amount of energy will be liberated when the electron returns to its initial state. Lyman series is observed when the electron returns to the lowest orbit while Balmer series is formed when the electron returns returns to second orbit. Similarly, Paschen, Brackett and Pfund series are formed when electrons returns to the third, fourth and fifth orbits from higher energy orbits respectively. When electrons return form n_(2) " to " n_(1) state, the number of lines in the spectrum will equal to ((n_(2)-n_(1))(n_(2)-n_(1)+1))/(2) If the electon comes back from energy level having energy E_(2) to energy level having energy E_(1) , then the difference may be expressed in terms of energy of photon as : E_(2)-E_(1)=DeltaE, deltaE implies (hc)/(lambda) Since, h and c are constant, deltaE corresponds to definite energy. Thus, each transition from one energy level to another will produce a radiatiob of definite wavelength. This is actually Wave number of a spectral line is given by the formula barv=R((1)/(n_(1)^(2))-(1)/(n_(2)^(2))) . where R is a Rydberg's constant (R=1.1xx10^(7) m^(-1)) What transition in the hydrogen spectrum would have the same wavelength as Balmer transitio, n=4 " to "n=2 in the He^(+) spectrum?

One of the fundamental laws of physics is that matter is most stable with the lowest possible energy. Thus, the electron in a hydrogen atom usually moves in the n=1 orbit, the orbit in which it has the lowest energy. When the electon is in this lowest energy orbit, the atom is said to be in its ground electronic state. If the atom receives energy from an outside source, it is possible for the electron to move ot an orbit with a higher n value, in which case the atoms is in an excited state with a higher energy. The law of conservation of energy says that we cannot create or destroy energy. Thus, if a certain amount of external energy is required to excite an electron from one energy level to another, then that same amount of energy will be liberated when the electron returns to its initial state. Lyman series is observed when the electron returns to the lowest orbit while Balmer series is formed when the electron returns returns to second orbit. Similarly, Paschen, Brackett and Pfund series are formed when electrons returns to the third, fourth and fifth orbits from higher energy orbits respectively. When electrons return form n_(2) " to " n_(1) state, the number of lines in the spectrum will equal to ((n_(2)-n_(1))(n_(2)-n_(1)+1))/(2) If the electon comes back from energy level having energy E_(2) to energy level having energy E_(1) , then the difference may be expressed in terms of energy of photon as : E_(2)-E_(1)=DeltaE, deltaE implies (hc)/(lambda) Since, h and c are constant, deltaE corresponds to definite energy. Thus, each transition from one energy level to another will produce a radiatiob of definite wavelength. This is actually Wave number of a spectral line is given by the formula barv=R((1)/(n_(1)^(2))-(1)/(n_(2)^(2))) . where R is a Rydberg's constant (R=1.1xx10^(7) m^(-1)) If the wavelength of series limit of Lyman series for He^(+) ion is x Å, then what will be the wavelength of series limit of Balmer series for Li^(2+) ion?

R SHARMA-STRUCTURE OF ATOM-Follow-up Test
  1. If in a gaseous sample of one mole of hydorgen atoms, the electron in ...

    Text Solution

    |

  2. What is the wavelength of a photon emitted during a transition form th...

    Text Solution

    |

  3. Which of the following is cprrect regarding Bohr's theory? (i) Elecr...

    Text Solution

    |

  4. Materials that have a color, such as dyed textiles and painted walls, ...

    Text Solution

    |

  5. The splitting of spectral lines in an external magnetic field is known...

    Text Solution

    |

  6. How many Bohr-Sommerfeld orbits are possible for n = 4?

    Text Solution

    |

  7. Which of the following is correct? (i) A particle of light, a photon...

    Text Solution

    |

  8. Which of the following is the limatation of de Broglie's analysis?

    Text Solution

    |

  9. Which of the following equations implies that a particle in motion can...

    Text Solution

    |

  10. The standing waves are generated by plucking a guitar string. The leng...

    Text Solution

    |

  11. The kinetic enegry of a moving electron is 3.0 xx 10^(-25)J. Calculate...

    Text Solution

    |

  12. A particle of charge q and mas m si accelerated from set through a pot...

    Text Solution

    |

  13. Find out the number of waves made by a bohr electron in one complete...

    Text Solution

    |

  14. The uncertainty principle is one of the basis principle of modern scie...

    Text Solution

    |

  15. Heisenberg's uncertainty principle is the direct consequence of (i) ...

    Text Solution

    |

  16. The solutions (there are many) to the Schrddot(o)dinger equation are c...

    Text Solution

    |

  17. The best way to think about a wave function is to regard it as an expr...

    Text Solution

    |

  18. A1though quantum mechanics tells us that we cannot pinpoint an elector...

    Text Solution

    |

  19. The mathematical approach of quantum mechanics involves treating the e...

    Text Solution

    |

  20. In 1926, Erwin Schrddot(o)dinger modified an existing equation that de...

    Text Solution

    |