MCQOPTIONS
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MCQOPTIONS
This section includes 155 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one is not the isotopes of hydrogen ? |
| A. | Protium |
| B. | Eritium |
| C. | Deuterium |
| D. | Tritium |
| Answer» C. Deuterium | |
| 2. |
Rutherford's scattering experiment related to the size of the |
| A. | nucleus |
| B. | atom |
| C. | electron |
| D. | neutron |
| Answer» B. atom | |
| 3. |
Isotopes of the same elements have |
| A. | same number of neutrons |
| B. | same number of protons |
| C. | same atomic mass |
| D. | different chemical properties |
| Answer» C. same atomic mass | |
| 4. |
Radioactive isotope of hydrogen is |
| A. | Protium |
| B. | Deuterium |
| C. | Tritium |
| D. | All |
| Answer» D. All | |
| 5. |
In an atom the order of filling up of the orbitals is governed by |
| A. | Aufbau principle |
| B. | Heisenberg's uncertainly principle |
| C. | Hund's rule |
| D. | Pauli's exclusion principle |
| Answer» B. Heisenberg's uncertainly principle | |
| 6. |
Regarding the atom of a chemical element, magnetic quantum number refers to |
| A. | orientation |
| B. | shape |
| C. | size |
| D. | spin |
| Answer» B. shape | |
| 7. |
Bohr model can explain about |
| A. | Spectrum of Hydrogen atoms |
| B. | Spectrum of one atom/ion having one electron only |
| C. | Spectrum of Hydrogen molecule |
| D. | None of these |
| Answer» C. Spectrum of Hydrogen molecule | |
| 8. |
Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and CI-In which of these pair are the ions/atoms iso - electronic with each other ? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 9. |
Which of the following electromagnetic wave has the longest wavelength ? |
| A. | Infra red rays |
| B. | Gamma rays |
| C. | Light rays |
| D. | Ultra-violet rays |
| Answer» B. Gamma rays | |
| 10. |
In isotopes the number of neutrons are |
| A. | same |
| B. | different |
| C. | both |
| D. | None of these |
| Answer» C. both | |
| 11. |
Species containing same number of electrons are called |
| A. | isotopes |
| B. | isobars |
| C. | isoelectronic |
| D. | isotones |
| Answer» D. isotones | |
| 12. |
Gamma rays are |
| A. | high energy electrons |
| B. | low energy electrons |
| C. | high energy electromagnetic |
| D. | high energy positrons waves |
| Answer» D. high energy positrons waves | |
| 13. |
Which one of the among the following is used as a moderator in nuclear reactors? |
| A. | Ozone |
| B. | Heavy hydrogen |
| C. | Heavy water |
| D. | Hydrogen peroxide |
| Answer» D. Hydrogen peroxide | |
| 14. |
In which one of the following is the valence electronic configuration, ns2np3found ? |
| A. | Carbon |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Argon |
| Answer» D. Argon | |
| 15. |
An ideal gas is one which obeys |
| A. | Gas laws |
| B. | Boyle's laws |
| C. | Charle's law |
| D. | Avogadro's law |
| Answer» B. Boyle's laws | |
| 16. |
Cinnabar is an ore of |
| A. | Hg |
| B. | Cu |
| C. | Pb |
| D. | Zn |
| Answer» B. Cu | |
| 17. |
The number of protons in a negatively charged atom (anion) is |
| A. | more than the atomic number of the element |
| B. | less than the atomic number of the element |
| C. | more than the number of elecrons in the atom |
| D. | less than the number of electrons in the atom |
| Answer» E. | |
| 18. |
The nucleus of a singly ionized carbon atom contains |
| A. | 6 protons and 6 neutrons |
| B. | 5 protons and 6 neutrons |
| C. | 6 protons and 6 neutrons and 6 electrons |
| D. | 12 protons and 6 neutrons and 6 electrons |
| Answer» B. 5 protons and 6 neutrons | |
| 19. |
Structure of solids investigated by using |
| A. | cosmic rays |
| B. | Z - rays |
| C. | infrared |
| D. | y - rays |
| Answer» C. infrared | |
| 20. |
The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have |
| A. | 10 protons and 7 electrons |
| B. | 7 protons and 10 electrons |
| C. | 4 protons and 7 electrons |
| D. | 4 protons and 10 electrons |
| Answer» C. 4 protons and 7 electrons | |
| 21. |
An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ? |
| A. | 25 |
| B. | 27 |
| C. | 35 |
| D. | 43 |
| Answer» D. 43 | |
| 22. |
Cathode rays are deflected towards |
| A. | (a) & (b) alternatively |
| B. | None of the above |
| Answer» B. None of the above | |
| 23. |
Which of the following has highest frequency ? |
| A. | Cosmic rays |
| B. | X - rays |
| C. | Radio waves |
| D. | Micro waves |
| Answer» B. X - rays | |
| 24. |
Which of the following has highest frequency? |
| A. | Cosmic rays |
| B. | X-rays |
| C. | Radio waves |
| D. | Micro wavews |
| Answer» B. X-rays | |
| 25. |
Which of the following electromagnetic wave has the longest wave length ? |
| A. | Infra red rays |
| B. | Gamma rays |
| C. | Light rays |
| D. | Ultra - violet rays |
| Answer» B. Gamma rays | |
| 26. |
Consider the following statements:1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.2. The maximum covalency of an element is limited to 6.Which of the statements given above is /are correct ? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» B. 2 only | |
| 27. |
Which one among the following is the equivalent weight of sulphuric acid?(Atomic weight : H = 1, S = 32, O = 16) |
| A. | 98 |
| B. | 60 |
| C. | 100 |
| D. | 49 |
| Answer» E. | |
| 28. |
Positive ions are formed from neutral atoms by loss of |
| A. | neutrons |
| B. | protons |
| C. | nuclear charge |
| D. | electrons |
| Answer» E. | |
| 29. |
Neutron was discovered by |
| A. | J.J. Thomson |
| B. | Chadwick |
| C. | Rutherford |
| D. | Priestley |
| Answer» C. Rutherford | |
| 30. |
Nuclear particles responsible for holding all nucleons together are |
| A. | electrons |
| B. | neutrons |
| C. | positrons |
| D. | mesons |
| Answer» E. | |
| 31. |
Protons and neutrons are bound in a nucleus by the |
| A. | short range 'weak interaction' |
| B. | short range 'strong interaction' |
| C. | long range 'electromagnetic interaction' |
| D. | long range 'gravitational interaction' |
| Answer» C. long range 'electromagnetic interaction' | |
| 32. |
Discovery of the nucleus of an atom was due to the experiment carried out by |
| A. | Bohr |
| B. | Rutherford |
| C. | Moseley |
| D. | Thomson |
| Answer» C. Moseley | |
| 33. |
The atomic orbital is |
| A. | the circular path of the electron |
| B. | elliptical shaped orbit |
| C. | three dimensional field around nucleus |
| D. | the region in which there is maximum probability of finding electron |
| Answer» E. | |
| 34. |
Meson was discovered by |
| A. | Powell |
| B. | Seaburg |
| C. | Anderson |
| D. | Yukawa |
| Answer» E. | |
| 35. |
The nuclear fuel in the sun is |
| A. | helium |
| B. | hydrogen |
| C. | uranium |
| D. | alpha particles |
| Answer» B. hydrogen | |
| 36. |
The atoms of the elements having same mass number but different atomic number are called |
| A. | isotopes |
| B. | isobars |
| C. | isotones |
| D. | isomers |
| Answer» C. isotones | |
| 37. |
Any P-orbital can accommodate up to |
| A. | 4-electrons |
| B. | 6-electrons |
| C. | 2-electrons in opposite |
| D. | None of these |
| Answer» C. 2-electrons in opposite | |
| 38. |
Wavelength of which of the following colors of the visible spectrum of light are maximally absorbed by green plants |
| A. | green and yellow |
| B. | red and blue |
| C. | green and red |
| D. | blue and yellow |
| Answer» C. green and red | |
| 39. |
Nucleons are |
| A. | protons and neutrons |
| B. | neutrons and electrons |
| C. | protons and electrons |
| D. | protons, neutrons and electrons |
| Answer» B. neutrons and electrons | |
| 40. |
Which of the following is not electromagnetic in nature |
| A. | Cathode rays |
| B. | x - rays |
| C. | y - rays |
| D. | Infrared - rays |
| Answer» B. x - rays | |
| 41. |
Cathode rays are |
| A. | electromagnetic wave |
| B. | stream of - particle |
| C. | stream of electrons |
| D. | radiations |
| Answer» D. radiations | |
| 42. |
The number of unpaired electrons in carbon atom is |
| A. | 2 |
| B. | 4 |
| C. | 1 |
| D. | 3 |
| Answer» B. 4 | |
| 43. |
When spectral lines obtained from atomic spectra is placed in a magnetic field they are splitted into number of fine lines, this is called .......... |
| A. | Stark's effect |
| B. | Photoelectric effect |
| C. | Zeeman's effect |
| D. | None of these |
| Answer» D. None of these | |
| 44. |
The constituent particle of a nucleus in an atom are |
| A. | electron and proton |
| B. | proton and neutron |
| C. | electron and neutron |
| D. | electron, proton and neutron |
| Answer» C. electron and neutron | |
| 45. |
The isotone of 76Ge32 is |
| A. | Ge |
| B. | As |
| C. | Se |
| D. | Se |
| Answer» E. | |
| 46. |
35CI17 and 37CI17 are called |
| A. | Isotopes |
| B. | Isomers |
| C. | Isotones |
| D. | None |
| Answer» B. Isomers | |
| 47. |
In 35CI34 and 37CI17 which of the following is false ? |
| A. | Both have 17 protons |
| B. | Both have 17 electrons |
| C. | Both have 18 neutrons |
| D. | Both show same chemical properties |
| Answer» D. Both show same chemical properties | |
| 48. |
Whose experiment proved that the speed of light was always the same |
| A. | James clark maxwell |
| B. | Michelson and Morley |
| C. | Miller and Stanley |
| D. | Werner Heisenberg |
| Answer» C. Miller and Stanley | |
| 49. |
Discovery of the nucleus of an atom was due to the experiment carried out by |
| A. | Bohr |
| B. | Rutherford |
| C. | Moseley |
| D. | Thomson |
| Answer» C. Moseley | |
| 50. |
CN- ion is isoelectronic with |
| A. | N |
| B. | CO |
| C. | both a & b |
| D. | none |
| Answer» D. none | |