MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The letters s p d and f are used to represent which quantum numbers |
| A. | Principal |
| B. | Azimuthal |
| C. | Magnetic |
| D. | Spin |
| Answer» C. Magnetic | |
| 2. |
All of the following were theorized by Bohr in his description of the atom except |
| A. | Angular momentum of electrons in multiples of h/2? |
| B. | Electrons revolve in discrete circular orbits |
| C. | Energy of each electron is directly proportional to n2 |
| D. | Electrons radiate energy continuously in a given orbit. |
| Answer» E. | |
| 3. |
The magnetic quantum number (QN) has its values determined directly by the value of |
| A. | Principal (QN) |
| B. | Azimuthal (QN) |
| C. | Spin (QN) |
| D. | Both a & b |
| Answer» C. Spin (QN) | |
| 4. |
The atomic number of an element having maximum number of unpaired electrons in p-subshell is |
| A. | 7 |
| B. | 10 |
| C. | 12 |
| D. | 16 |
| Answer» B. 10 | |
| 5. |
The maximum number of electron in a sub shell with ? = 3fs |
| A. | 6 |
| B. | 10 |
| C. | 14 |
| D. | 18 |
| Answer» D. 18 | |
| 6. |
Radius of the third shell of H-atom is |
| A. | 5.761 A? |
| B. | 4.761 A? |
| C. | 6.671 A? |
| D. | 3.716 A? |
| Answer» C. 6.671 A? | |
| 7. |
When an atom absorbs energy the lines in the spectrum will appear which are |
| A. | Brighter |
| B. | Darker |
| C. | Colourless |
| D. | Hard to locate |
| Answer» C. Colourless | |
| 8. |
Which one of the following explain the shape of orbitals |
| A. | Principal of quantum number |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | Spin quantum number |
| Answer» C. Magnetic quantum number | |
| 9. |
Atom cannot be divided into simple unitstheorized by |
| A. | Rutherford |
| B. | Dalton |
| C. | Bohr |
| D. | Schrodinger |
| Answer» C. Bohr | |
| 10. |
Pressure in gas discharge tube was kept |
| A. | 10 torr |
| B. | 1 torr |
| C. | 0.1 torr |
| D. | 0.01 torr |
| Answer» E. | |
| 11. |
Angle of deflection was studied by |
| A. | Hitorff |
| B. | Stoney |
| C. | William Crookes |
| D. | J.Perrin |
| Answer» E. | |
| 12. |
Positive rays give flash on |
| A. | AgNO3 plate |
| B. | AgCl plate |
| C. | ZnO |
| D. | ZnS |
| Answer» E. | |
| 13. |
The number of fundamental particles in an atom of the lightest isotope carbon are |
| A. | 6 |
| B. | 12 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 14. |
Increase in atomic number is observed during |
| A. | Alpha emission |
| B. | Beta emission |
| C. | Both a & b |
| D. | Radioactivity |
| Answer» C. Both a & b | |
| 15. |
The value of e/m ratio of electron is |
| A. | 6.02 x 1023 C/kg |
| B. | 1.7588 x 1020 C/kg |
| C. | 9.1095 x 10-31 C/kg |
| D. | 1.7588 x 1011 C/kg |
| Answer» E. | |
| 16. |
Charge of electron was measured by |
| A. | J.J Thomson |
| B. | Millikan |
| C. | Rutherford |
| D. | Perrin |
| Answer» C. Rutherford | |
| 17. |
Free neutron changes into proton with the emission of |
| A. | Neutrino |
| B. | Electron |
| C. | Both a & b |
| D. | Meson |
| Answer» D. Meson | |
| 18. |
Rutherford bombarded ______________ particles in discovery of nucleus |
| A. | Gamma-rays |
| B. | Alpha-rays |
| C. | Beta-rays |
| D. | X-rays |
| Answer» C. Beta-rays | |
| 19. |
Planks theory says energy is emitted |
| A. | In continuous manner |
| B. | Discontinuous manner |
| C. | Simultaneously |
| D. | In the form of heat |
| Answer» C. Simultaneously | |
| 20. |
Angular momentum of an electron |
| A. | N2h/2? |
| B. | Nk2/2? |
| C. | Nh/4? |
| D. | Nh/2? |
| Answer» E. | |
| 21. |
The maximum number of orbitals present in a subshell that is represented by Azimuthal quantum number = 3 will be |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 22. |
Colour of fluorescene produced by cathode rays depends upon |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | Composition of glass |
| Answer» E. | |
| 23. |
Which one is not true about cathode rays? |
| A. | 9.11x10-31 Kg |
| B. | Cast shadow |
| C. | Heat up the platinum foil |
| D. | Cannot ionize |
| Answer» E. | |
| 24. |
A fast moving neutron can eject from nitrogen |
| A. | ? = rays |
| B. | ? = rays |
| C. | ? = rays |
| D. | Electrons |
| Answer» C. ? = rays | |
| 25. |
Positive rays are produced |
| A. | By burning of gas |
| B. | By cooling of the gas |
| C. | By the bombardment of cathode rays on gas molecules |
| D. | From anode like cathode rays produced from cathode |
| Answer» D. From anode like cathode rays produced from cathode | |
| 26. |
Rutherfords planet like structure was defective and unsatisfactory because |
| A. | Moving e- accelerate towards the nucleus |
| B. | Continuous spectrum |
| C. | Behavior of electron remain unexplained |
| D. | All |
| Answer» E. | |
| 27. |
The relationship between energy of a photon of light and its frequency is given by |
| A. | De-Broglie duel nature of matter |
| B. | Bohrs model |
| C. | Plancks Quantum theory |
| D. | Rutherfords atomic model |
| Answer» D. Rutherfords atomic model | |
| 28. |
The velocity of the photon |
| A. | Is independent of wavelength |
| B. | Depends upon source |
| C. | Depends upon its frequency |
| D. | Equals to the square of amplitude |
| Answer» B. Depends upon source | |
| 29. |
Splitting of spectral lines when atom is subjected to magnetic field is called |
| A. | Zeemans effect |
| B. | Starks effect |
| C. | Photo electric effect |
| D. | Compton effect |
| Answer» B. Starks effect | |
| 30. |
When 6d orbital is complete the entering electron goes into |
| A. | 7f |
| B. | 7s |
| C. | 7p |
| D. | 7d |
| Answer» D. 7d | |
| 31. |
When electron jump into orbit 1 then series obtained is |
| A. | Lyman |
| B. | Paschen |
| C. | Pfund |
| D. | Brackett |
| Answer» B. Paschen | |
| 32. |
Neutrons moving with an energy of 1.2 MeV are called |
| A. | Fast neutrons |
| B. | Slow neutrons |
| C. | Moderate neutrons |
| D. | All are possible |
| Answer» B. Slow neutrons | |
| 33. |
Splitting of spectral lines when atoms are subjected to strong electric filed is called |
| A. | Zeeman effect |
| B. | Stark effect |
| C. | Photoelectric effect |
| D. | Compton effect |
| Answer» C. Photoelectric effect | |
| 34. |
Three quantum number have been derived from equation of |
| A. | De-Broglie |
| B. | Plancks |
| C. | Schrodinger |
| D. | Heisenberg |
| Answer» D. Heisenberg | |
| 35. |
The correct electronic configuration of Cu is |
| A. | [Ar]4s1 |
| B. | [Ar]4s2 |
| C. | [Ar]3d104s1 |
| D. | [Ar]3d94s2 |
| Answer» D. [Ar]3d94s2 | |
| 36. |
Pfund series are produced in the spectrum of hydrogen atom |
| A. | When electrons jump down to 2nd- orbit |
| B. | When electrons jump down to 3rd- orbit |
| C. | When electrons jump down to 4th- orbit |
| D. | When electrons jump down to 5th- orbit |
| Answer» E. | |
| 37. |
Atomic orbits having same evergy are called |
| A. | Degenerate orbitals |
| B. | Bonding molecular orbitals |
| C. | Anti bonding molecular orbitals |
| D. | Half filled orbitals |
| Answer» B. Bonding molecular orbitals | |
| 38. |
Sommerfelds modification in Bohrs model is |
| A. | Orbit is cylindrical |
| B. | Orbit is elliptical |
| C. | Orbit is longitudinal |
| D. | Orbit is asymmetrical |
| Answer» C. Orbit is longitudinal | |
| 39. |
Atom with higher atomic number produces X-rays of |
| A. | Shorter wavelength |
| B. | Larger wavelength |
| C. | X-ray not produced |
| D. | All are possible |
| Answer» B. Larger wavelength | |
| 40. |
When electrons collide with heavy metals than ______ are produced. |
| A. | Beta-rays |
| B. | Alpha-rays |
| C. | X-rays |
| D. | Gamma-rays |
| Answer» D. Gamma-rays | |
| 41. |
Plancks equation is |
| A. | E = mc2 |
| B. | Mvr = nh/2? |
| C. | E = h? |
| D. | ? = h/mv |
| Answer» D. ? = h/mv | |
| 42. |
Wavelength of electron was verified by |
| A. | Moseley |
| B. | Davisson and Germer |
| C. | Einstein |
| D. | Roentgen |
| Answer» C. Einstein | |
| 43. |
Space around nucleus where finding probability of electrons is maximum is called |
| A. | Orbital |
| B. | Orbit is elliptical |
| C. | Subshell |
| D. | Electron cloud |
| Answer» B. Orbit is elliptical | |
| 44. |
Quantum number which tells the energy of electron is |
| A. | N |
| B. | 1 |
| C. | M |
| D. | S |
| Answer» B. 1 | |
| 45. |
Electronic configuration of K is |
| A. | [Ar]4s2 |
| B. | [Ar]4s1 |
| C. | [Kr]5s1 |
| D. | [He]2s1 |
| Answer» C. [Kr]5s1 | |
| 46. |
____________ can expel proteons from paraffins |
| A. | Electron |
| B. | Positron |
| C. | Neutron |
| D. | None of above has such capability |
| Answer» D. None of above has such capability | |
| 47. |
Milikan used __________ in his atomizer |
| A. | Milk |
| B. | Honey |
| C. | Oil |
| D. | Water |
| Answer» D. Water | |
| 48. |
Centrifugal forces are balanced in atom by |
| A. | Attractive forces |
| B. | Repulsive force |
| C. | Electrons |
| D. | Neutrons |
| Answer» B. Repulsive force | |
| 49. |
Spectrum is produced due to |
| A. | Different wavelength |
| B. | Different colours |
| C. | Different intensities |
| D. | All have little contribution |
| Answer» B. Different colours | |