chemistry - structure of atom

Class 11 - Chemistry

Structure of Atom

MCQ
Q&A
Question:

Write the electronic configuration and number of unpaired electrons in  Fe2+ion.

Answer:

Fe (Z = 26) : [Ar]18 3d64s2
Fe2+ion : [Ar]18 3d6
No. of unpaired electrons = 4



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Questions and Answers


Structure of Atom - Questions
1.

What are degenerate orbitals ?


Answer
2.

What is value of Planck’s constant in S.I. units?


Answer
3.

Arrange X-rays, cosmic rays and radio waves according to frequency.


Answer
4.

Which series of lines of the hydrogen spectrum lie in the visible region?


Answer
5.

An electron beam on hitting a ZnS screen produces a scientillation on it. What do you conclude?


Answer
6.

Discuss the similarities and differences between a 1s and a 2s orbital.


Answer
7.

What mil be the order of energy levels 3s, 3p and 3d in case of H-atom?


Answer
8.

How many unpaired electrons are present in Pd (Z = 46) ?


Answer
9.

What is difference between the notations l and L?


Answer
10.

With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength = 5200 A?


Answer
11.

Using Aufbau principle, write the ground state electronic configuration of following atoms.
(i)Boron (Z = 5) (ii) Neon (Z = 10), (iii) Aluminium (Z = 13) (iv) Chlorine (Z = 17), (v) Calcium (Z = 20) (vi) Rubidium (Z = 37)


Answer
12.

The kinetic energy of an electron is  4.55 x 10-25 J. The mass of electron  9.1 x 10-1 kg.  Calculate velocity, momentum and the wavelength of the electron?(Haryana Board, 2004, AII CBSE 2000)


Answer
13.

What is the wavelength for the electron accelerated by  1.0 x 104 volts?


Answer
14.

What are the two longest wavelength lines (in manometers) in the Lyman series of hydrogen spectrum?


Answer
15.

Define atomic number, mass number and neutron. How are the three related to each other?


Answer
16.

State and explain the following:
(i) Aufbau principle
(ii) Pauli exclusion principle.
(iii) Hund’s rule of maximum multiplicity.


Answer
17.

What is the minimum product of uncertainty in position and momentum of an electron?


Answer
18.

What is the difference between the notations l and L?


Answer
19.

Arrange s, p and d sub-shells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in them


Answer
20.

Calculate the total number of angular nodes and radial nodes present in 3p orbital.


Answer
21.

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?


Answer
22.

Which element does not have any neutron?


Answer
23.

What is common between dxy  and  dx2-y 2  orbitals?


Answer
24.

If n is equal to 3, what are the values of quantum numbers l and m?


Answer
25.

An electron beam after hitting a neutral crystal produces a diffraction pattern? What do you conclude?


Answer
26.

Distinguish between a photon and quantum.


Answer
27.

When is the energy of electron regarded as zero?


Answer
28.

In a hydrogen atom, the energy of an electron in first Bohr’s orbit is  13.12 x 105 J mol-1.  What is the energy required for its excitation to Bohr’s second orbit?


Answer
29.

What were the weaknesses or limitations of Bohr’s model of atoms ? Briefly describe the quantum mechanical model of atom.


Answer
30.

Giue flic name and atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference between the numbers of total p and total s-electrons.


Answer
31.

How many electrons in an atom can have n + l = 6?


Answer
32.

Arrange the electron (e), protons (p) and alpha particle (α) in the increasing order for the values of e/m (charge/mass).


Answer
33.

Show the distribution of electrons in oxygen atom (atomic number 8) using orbital diagram.


Answer
34.

Show the distribution of electrons in oxygen atom (atomic number 8) using orbital diagram.


Answer
35.

Which of the following will not show deflection from the path on passing through an electric field?
Proton, cathode rays, electron, neutron.


Answer
36.

Give the relation between wavelength and momentum of moving microscopic particle. What is the relation known as?


Answer
37.

Write the electronic configuration and number of unpaired electrons in  Fe2+ion.


Answer
38.

What is the most important application of de Broglie concept?


Answer
39.

Which one  Fe3+, Fe2+is more paramagnetic and why?


Answer
41.

The uncertainty in the position and velocity of a particle are  10-10m and  5.27 x 10-24 ms-1  respectively. Calculate the mass of the particle. (Haryana Board 2000)


Answer
42.

(a) What is the limitations of Rutherford model of atoms?
(b) How has Bohr’s theory helped in calculating the energy of hydrogen electron in different energy levels?


Answer
43.

Which orbital is non-directional?


Answer
44.

An anion A3+has 18 electrons. Write the atomic number of A.


Answer
45.

The electronic configuration of valence shell of Cu is 3d10 4s 1 and not 3d94s2. How is this configuration explained?


Answer
46.

The Balmer series in the hydrogen spectrum corresponds to the transition from n1 = 2 to n2 = 3, 4,……… This series lies in the visible region. Calculate  the wave number of line associated with the transition in Balmer series when the electron moves to n = 4 orbit. (RH = 109677 cm-1).


Answer
47.

The uncertainty in the position of a moving bullet of mass 10 g is  10-5    m. Calculate the uncertainty in its velocity?


Answer
48.

What type of metals are used in photoelectric cells? Give one example.


Answer
49.

Calculate the de Broglie wavelength of an electron moving with 1% of the speed of light?


Answer
50.

Which of the following orbitals are degenerate?
3dxy, 4dxv, 3dyz, 3dz2:, 4dyz., 4dz2:


Answer
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