Atomic Structure:Quiz

homehome

phone wapp

arrow_downwardDown

phone wapp

facebookfbook

star_rateseeker

1) Number of neutrons in Uranium 235 is:

1. 140
2. 152
3. 142
4. 143

Ans = 143

2) Which particles were used by Rutherford for experiment?

1. Alpha particles
2. Beta particles
3. Gamma rays
4. Atoms

Ans = Alfa particles

3) which of the following is described as finger prints of elements ?

1. mass
2. Volume
3. Line spectra
4. Atomic structure

Ans = Atomic Spectra

4) In periodic table, non-metals are found on the

1. right hand side
2. left hand side
3. In the middle
4. bottom of periodic table

Ans = Right hand side

5) Elements with full outermost shells are:

1. metals
2. non-metals
3. inert gases
4. neutral atoms

Ans = Inert gases

6) Isotopes have similar:

1. chemical properties
2. physical properties
3. number of neutrons
4. mass numbers

Ans = chemical properties

7) In tritium, number of neutrons are:

1. 3
2. 0
3. 1
4. 2

Ans = 2

8) Electromagnetic radiation with maximum wavelength ?

1. IR
2. X-Rays
3. Radio waves
4. UV

Ans =Radio waves

9) The series of lines present in the visible region of hydrogen spectrum is :

1. Layman
2. Balmer
3. Paschen
4. Brackett

Ans = Balmer

10) Correct electronic configuration of Fe2+ is(At.no:26) :

1. 1s2 2s2 2p6 3s2 3p6 3d6
2. 1s2 2s2 2p6 3s2 3p6 3d6 4s2
3. 1s2 2s2 2p6 3s2 3p6 3d6 4s2 4p2
4. 1s2 2s2 2p6 3s2 3p6 3d7 4s1

Ans = 1s2 2s2 2p6 3s2 3p6 3d6 4s2

11) Which of the following determines that the electronic configuration of Nitrogen is:

1s2 2s2 2px1 2py1 2pz1 .

1. Pauli exclusion principle
2. Aufbau principle
3. Hund’s rule
4. Bohr-Burry rule

Ans = Hund's rule
Explanation:This rule states that the pairing of electrons will not take place in degenerate orbitals until each orbital is first singly filled with parallel spin.

12) Any p-orbital can accommodate upto :

1. Four electrons
2. Two electrons with parallel spin
3. Six electrons
4. Two electrons with anti -parallel spin

Ans = Two electrons with anti -parallel spin

13) Which of the following has largest de-Broglie wavelength if all have equal velocity ?

1. Carbon dioxide molecule
2. Electron
3. Ammonia molecule
4. Proton

Ans = Electron

14) The correct set of quantum numbers for the unpaired electron of chlorine atom is:

1. 2, 0, 0, +1/2
2. 3, 0, 0, -1/2
3. 3, 1, 1, 1/2
4. 3, 1, -1, +1/2

Ans = 3,1,1,1/2

15) Which of the following has maximum number of unpaired electrons ?

1. Zn
2. Fe2+
3. Ni3+
4. Cu+

Ans = Fe2+

16) The orbital angular momentum of an electron is given by :

1. √l(l+1)h/2π
2. n*h/2π
3. mvr
4. h/mν

Ans =√l(l+1)h/2π

17) According to Bohr theory the angular momentum of an electron in the 5th orbit is :

1. 25 h/π
2. 2.5 h/π
3. 1.0 h/π
4. 10 h/π

Ans = 2.5 h/π

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

1. 0.5 h/2π
2. h/2π
3. 0
4. √2h/π

Ans = 0

19) For a d-electron, the orbital angular momentum is :

1. √6 h/2π
2. √2 h/2π
3. h/2π
4. 2h/2π

Ans = √6 h/2π

20) According to Bohr’s theory, which one of the following values of angular momentum of hydrogen atom is not permitted ?

1. 0.5h/π
2. 1.25h/π
3. h/π
4. 1.5h/π

Ans = 1.25h/π

21) The angular momentum of an electron present in the excited state of hydrogen is 1.5h/π . The electron is present in:

1. 3rd orbit
2. 4th orbit
3. 5th orbit
4. 2nd orbit

Ans = 3rd orbit

22) If an electron falls from n = 3 to n = 2 in the H –atom , the emitted energy will be :(1ev = 1.602*10-19 J)

1. 10.2 eV
2. 12.09 eV
3. 1.9 eV
4. 0.65 eV

Ans = 1.9 eV

23) The total number of orbitals in a shell having principal quantum number n is given by :

1. 2n
2. n2
3. 2n2
4. n+1

Ans = n2

24) Which of the following has maximum number of unpaired d- electrons ?

1. Zn2+
2. Fe2+
3. Ni2+
4. Cu+

Ans = Fe2+

25) The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is :

1. 6.63× 10-33 m
2. 6.63× 10-34 m
3. 6.63× 10-35 m
4. 6.63× 10-36 m

Ans = 6.63× 10-36 m

26) The visible region in the line spectrum of H –atom corresponds to :

1. Layman series
2. Balmer series
3. Paschen series
4. Brackett series

Ans = Balmer series

27) Brackett series is produced when electron from the outer orbit jumps to :

1. 2nd orbit
2. 3rd orbit
3. 4th orbit
4. 5th orbit

Ans = 4th orbit

28) Which of the species is isoelectronic with CO ?

1. CN-
2. O2
3. Cl2
4. CO2

Ans = CN-

29) 1s2,2s2,2px1,2py1,2pz1 is the electronic configuration of :

1. N
2. O
3. Na
4. C

Ans = N

30) The momentum of a particle having de-Broglie wavelength 1.0 * 10-17 m is :

1. 6.626 * 10-17 kg ms-1
2. 6.626 * 10-31 kg ms-1
3. 13.25 * 10-17 kg ms-1
4. 26.5 * 10-7 kg ms-1

Ans = 6.626 * 10-17 kg ms-1

31) Which is more massive among the following ?

1. Electron
2. Proton
3. Neutron
4. Meson

Ans = Neutrons

32) The total possible values for the magnetic quantum number for l=3 is

1. 3
2. 1
3. 5
4. 7

Ans = 7

33) The number of unpaired electrons in carbon atom is?

1. 3
2. 2
3. 1
4. 4

Ans = 4

34) An atom has highest principal quantum number 4.How many electrons it can accommodate?.

1. 10
2. 54
3. 18
4. 32

Ans = 32

35) Which of the following element’s valence shell last electron has magnetic quantum number m = 0 ?

1. N
2. O
3. Cl
4. Na

Ans = Na

36) The energy of a photon is 3.0 * 10-19 J. What will be the wavelength of this photon?

1. 65.6 nm
2. 6.56 nm
3. 656 nm
4. 0.656 nm

Ans = 656 nm

37) The number of unpaired electrons in Mn2+ is

1. 4
2. 5
3. 7
4. 3

Ans = 5

38) The angular momentum mvr of a moving electron is equal to

1. h
2. nh/2π
3. nh/π
4. n/2π

Ans = nh/2π

39) The value of Planck’s constant is :

1. 6.626 × 10-34 kg m2s-1
2. 6.626 × 10-34 kg m s-1
3. 6.626 × 10-34 kg m2s-1
4. 6.626 × 10-32 kg m2s-1

Ans = 6.626 × 10-34 kg m2s-1

40) The maximum number of electrons in any shell is given by:

1. n2
2. ½ n2
3. 2n2
4. None of the above

Ans = 2n2

41) The wave number of 1st line in Layman series of Hydrogen spectrum is :(RH = 109678 cm-1 )

1. 82000 cm-1
2. 82259 -1
3. 97492 cm-1
4. 102823 cm-1

Ans =82259 -1

42) As we move away from the nucleus ,what happens to the energy of the orbit ?

1. Decreases
2. Increases
3. Remains unchanged
4. None of the above

Ans = Increases

43) The atomic number of Ra is 88 and its mass number is 226 . How many neutrons are present in radium ?

1. 86
2. 226
3. 140
4. 138

Ans = 138

44) When an electron is lost from the atom :

1. Size of nucleus decreases
2. Size of nucleus increases
3. Size of nucleus remains unaffected
4. The size of atom increases

Ans =Size of nucleus remains unaffected

45) All atomic nuclei except protium contain :

1. Protons
2. Electrons
3. Neutrons
4. Photons

Ans = Neutrons

46) A radio station broadcasts in a frequency of 5.0 * 105 Hz. The wavelength of signal will be:

1. 100 m
2. 50 m
3. 500 m
4. 600 m

Ans = 600 m

47) The spectra of hydrogen atom when an electron makes a transition from:

n= 4,5,6,7,8 to n = 3 is called:

1. Lyman
2. Balmer
3. Paschen
4. Pfund

Ans = Paschen

48) How many coulombs of charge an electron carries ?

1. 1.602×10-19 coulombs
2. 95600 coulombs
3. 6.022×10-23 coulombs
4. 22400 coulombs

Ans = 1.602×10-19 coulombs

back next

homehome

phonewapp

arrow_upwardgoup

phonewapp

facebookfbook

star_rateseeker