JEE Previous Year Questions- Structure of Atom with solutions - Free MCQ

An atom has a mass of 0.02 kg & uncertainity in its velocity is 9.218 × 10^-6 m/s then uncertainity in position is (h = 6.626 × 10^-34 J - s)                                                            [AIEEE- 2002]

Energy of H–atom in the ground state is -13.6 eV , Hence energy in the second excited state is– 

Uncertainty in position of a particle of 25 g in space is 10^-5 m. Hence uncertainty in velocity (ms^-1) is (Planck's constant h = 6.6 × 10^-34 Js)                                                            [AIEEE- 2002]

The orbital angular momentum for an electron revolving in an orbit is given by  . This momentus for an s-electron will be given by -                                                                                 [AIEEE- 2003]

In Bohr series of lines of hydrogen spectrum, third line from the red end corresponds to where one of the following inter-orbit jumps of electron for Bohr orbits in an atom of hydrogen.                [AIEEE- 2003]

The de Broglie wavelength of a tennis ball mass 60 g moving with a velocity of 10 mt. per second is approximately -                                                                                             [AIEEE- 2003]

Which of the following sets of quantum numbers is correct for an electron in 4f orbital ?          [AIEEE- 2004]

Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively                                                                  [AIEEE- 2004]

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097×10⁷ m^-1)                                           [AIEEE- 2004]

Which one of the following sets of ions represents the collection of isoelectronic species ? [AIEEE- 2004]

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields ?                [AIEEE- 2005]

(a) n = 1, l = 0, m = 0

(b) n = 2, l = 0, m = 0

(c) n = 2, l = 1, m = 1

(d) n = 3, l = 2, m = 1

(e) n = 3, l = 2, m = 0

Of the following sets which one does NOT contain isoelectronic species ?               [AIEEE- 2005]

According to Bohr's theory, the angular momentum of an electron in 5^th orbit is -        [AIEEE 2006]

Uncertainty in the position of an electron (mass = 9.1 × 10^-31 kg) moving with a velocity 300 m/s, accurate upto 0.001 %, will be (h = 6.63 × 10^-34 Js)                                         [AIEEE 2006]

Which of the following sets of quantum numbers represents the highest energy of an atom ? [AIEEE 2007]

The ionization enthalpy of hydrogen atom is 1.312 × 10⁶ J mol^-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is                                                       [AIEEE 2008]

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6×10^-34 kg m²s^-1 ,mass of electron, e_m = 9.1×10^-31 kg )    [AIEEE 2009]

Calculate the wavelength (in nanometer) associated with a proton moving at 1.0×10³ms^-1

(Mass of proton = 1.67×10^-27 kg and h = 6.63×10^-34 Js ) :                                        [AIEEE 2009]

The energy required to break one mole of Cl - Cl bonds in Cl₂ is 242 kJ mol^-1. The longest wavelength of light capable of breaking a single Cl - Cl bond is(c = 3 x 10⁸ ms^-1 and N_A = 6.02 x 10²³ mol^-1)                                                                                                                                                                       [AIEEE 2010]

Ionisation energy of He⁺ is 19.6 x 10^-18 J atom-1. The energy of the first stationary state (n = 1) of Li²⁺ is

[AIEEE 2010]

 Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect ?

[AIEEE 2012]

The electrons identified by quantum numbers 'n' and l :                                  [AIEEE 2012]

(a) n = 4, l = 1

(b) n = 4, l = 0

(c) n = 3, l = 2

(d) n = 3, l = 1

can be placed in order of increasing energy as :

The standard reduction potentials for Zn²⁺/Zn, Ni²⁺/Ni, and Fe²⁺/Fe are -0.76, -0.23 and -0.44 V respectively. The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when:             [AIEEE 2012]

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be:

[AIEEE 2013]

Energy of an electron is given by E = -2.178 × 10^-18 Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be (h = 6.62 × 10^-34 Js and c = 3.0 × 10⁸ ms^-1)    

[AIEEE 2013]

Which of the following is the wrong statement ?                                                                       [AIEEE 2013]

Which of the following arrangements does not represent the correct order of the property stated against it?

[AIEEE 2013]

In a hydrogen like atom electron make transition from an energy level with quantum number n to another with quantum number (n - 1). If n >> 1, the frequency of radiation emitted it proportional to   [AIEEE 2013]