Unsolved Assignment: – Structure of Atom
Structure Of Atom is very important topics. You will get the question in all competitive exams like PGT,TGT,TET,CBSE.ISC. Here we are providing some important questions. if yiyr are facing any problem in any question plz feel free to write in comment box. definitely we will rely.
1. Calculate the number of electron which will together weigh 1 g. (ans. 1.09 x 1027)
2. Calculate the charge and mass of 1 mole of electron.
3. How many orbitals are present in 3rd shell?
4. Calculate the value of all four quantum numbers for 3d.
5. Calculate the angular momentum of an electron present in d subshell.
6. Write electronic configuration of Cu+2, Cr+, and Cu+.
7. State physical significance of Ψ2.
8. An electron has a speed of 40 ms-1 accurate up to 99.99% what is the uncertainty in locating its position. (ans. 1.477 x 10-2)
9.What is the wave length of light emitted when an electron in the hydrogen atom undergoes transition from an energy level with n = 4 to an energy level; with n = 2. What will be its electromagnetic spectrum region? (ans. 486 nm, visible)
10.What is the maximum number of emission lines when the excited electron of a hydrogen atom in n = 6 drops to the ground state. (ans. 15)
11.Calculate the no of electron, protons, and neutrons in :-17Cl35, 92U235,11Na23 , 54I-218Ar36.
12.The Vivid Bharti station of all India radio, Delhi, Broadcasts on a frequency of 136 KHz. Calculate the wave number of electromagnetic radiation emitted by transmitter. Which part of electromagnetic spectrum does it belong to? (Ans 219.3 m-1, radio wave.)
13.Calculate: – (i) wave number (ii) frequency of yellow radiation having wavelength 5800 Ao (Ans. 1.724 x 10-6, 5.172 x 1014 s-1)
14. Calculate the energy of 1 mol of photons of radiation whose frequency is 5 * 1014 Hz
15. Calculate the mass of photon with wave length 3.6 * 106 A0. (ans. 6.135 x 10-33 kg)
16.Using s, p, d, f, notation describe the orbital with following quantum number and pick out the possible and explain:- (i) n = 4, l = 1 (ii) n = 2, l = 0 (iii) n = 5, l = 3 (iv) n = 3, l = 2 ( v ) n= 2, l = 3 (vi) n = 3, l = 4, (vi) n = 2, l = 2.
17.What is number of photons of light with wavelength of 4000 pm provide that 1 j of energy?
18. Prove that electron dos not exist in nucleus and proton does not revolve around the nucleus.
19. What is e/m value? e/m value remain constant for —– rays. Explain.
20.What is the relationship in given species:- (i) 6C14and 7N14 (ii) CO and N2 (iv) Ne Na+ Al+3 (v)Protium , Deuterium, tritium (vi) 8O16 and 7N15
21. Explain the origin of Cathode and Anode rays.
22. What are the limitations of Rutherford Model of an atom?
23. What is exchange energy? Explain its significance.
24. What are the properties of cathode rays?
25. A golf ball has a mass of 40 g and speed 45 ms-1. If the speed can be measured with inaccuracy of 2 %. Calculate the uncertainty in position.
26. Calculate the number of nodes in 3d, 6f and 5p.
27. A photon of wavelength 4*10-7 m strike on the metal surface, the work function of the metal being 2.13 ev. Calculate the energy of photon (ev) and kinetic energy of the emission and velocity of photoelectron.
28.Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 A0. Calculate (i) threshold frequency and (ii) work function. (Ans. i. 4.41 x 1014ii. 2.92 x 10-19)
29. What are the differences b/w matter wave and electromagnetic wave?
30. Give the differences b/w orbit and orbitals.
31. What is n+l rule? [ Hint:- for the compression of Energy of subshells, Lower the value of (n+l) lower the energy]
32.Calculate the radius of 3rd shell of an atom of H and Li+3.
33.Define Pauly exclusion principle.
34.Derive de Broglie equation.
35. What is the significance of Heisenberg uncertainty principle in daily life?
36. Explain Hund’s rule of maximum multiplicity.
37. Why Hund’s rule state “pairing of electrons cannot take place until each orbital singly occupy”?
38. What are isosteres and isodiapheres species?
39. Calculate the short and long wavelength limits of Lymen series in hydrogen spectrum. (ans.9.118x 10-6 cm, and 1.26 x 10-5cm)
40. A Spectral line in Balmer series of hydrogen spectra correspond to wavelength 6561 A0. Find the energy level involved in the transition responsible for origin of this line? R= 109679 cm–1 (ans n=3)
41. An electron is moving with a kinetic energy of 4.55 *10-25 J. calculate its de Broglie wave length. (ans.7.278 x 10-7 m)
42.Arrange the following type of radiations in increasing order of frequency: – radiation of microwave oven, amber light from traffic signal, radiation from FM radio, cosmic rays from outer space, X- rays.
43.A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57 μm. Calculate the rate of emission of quanta per second.
44.If the diameter of a carbon atom is 0.15 nm calculate the no of C atoms which can be placed side wise side in a straight line across length of scale of length 20 cm long. (ans. 1.33 x 109)
45.2*108 atoms of C are arranged side wise side. Calculate the radius of C atom if the length of arrangement is 2.4 cm. (ans. 6.0 x 1011 m)
46.The diameter of Zinc atom is 2.6 A0. Calculate (i) radius of Zn atom in pm and (ii) no. of atoms present in length of 1.6 cm. if the zinc atoms are arranged side wise side lengthwise.
47.What is quantum mechanics? Which is known as heart of quantum mechanics?
48.Write Schrodinger wave equation. Define Eigen value and Eigen function.
49.Which quantum no is not derived from quantum mechanics?
50. What are the differences b/w orbit and orbitals?
51 In which region Paschen and Balmer series exit?
52 Draw the shape of dx2-y2 and dz2orbitals.
53 Calculate the no of nodes in 3d and 4p subshell