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.
| 51. |
The number of unpaired electrons in Mn2+ is |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 52. |
The atoms of the elements which have same number of neutrons are called |
| A. | Isobars |
| B. | Isotopes |
| C. | Isotones |
| D. | None |
| Answer» D. None | |
| 53. |
7Li3 and 8Be4 are called |
| A. | Isotopes |
| B. | Isobar |
| C. | Isotones |
| D. | None |
| Answer» D. None | |
| 54. |
Who discovered the Electron ? |
| A. | Chadwik |
| B. | Bohr |
| C. | Thomson |
| D. | Rutherford |
| Answer» D. Rutherford | |
| 55. |
Wavelength of X - rays is of the order of |
| A. | 1 mm |
| B. | 1 cm |
| C. | 1 micron |
| D. | 1 angstrom |
| Answer» E. | |
| 56. |
Which of the properties of the elements is a whole number ? |
| A. | Atomic mass |
| B. | Atomic number |
| C. | Atomic radius |
| D. | Atomic volume |
| Answer» C. Atomic radius | |
| 57. |
The number of neutrons in dipositive zine ion (Zn2+, mass number 70 and atomic number 30) is |
| A. | 34 |
| B. | 36 |
| C. | 38 |
| D. | 40 |
| Answer» E. | |
| 58. |
Consider the following part of spectra 1. visible2. infrared3. ultraviolet 4. microwaveWhich of the following is the correct sequance in which the wavelengths in crease ? |
| A. | 4 - 3 - 1 - 2 |
| B. | 4 - 1 - 2 - 3 |
| C. | 3 - 2 - 1 - 4 |
| D. | 3 - 1 - 2 - 4 |
| Answer» E. | |
| 59. |
Propagation of light quanta may be described by |
| A. | photons |
| B. | protons |
| C. | neutrons |
| D. | electrons |
| Answer» B. protons | |
| 60. |
The charge on position is equal to the charge on |
| A. | proton |
| B. | electron |
| C. | - particle |
| D. | neutron |
| Answer» B. electron | |
| 61. |
Which one of the following elements has two electrons in the K - shell only ? |
| A. | Hydrogen |
| B. | Helium |
| C. | Neon |
| D. | Sulphur |
| Answer» C. Neon | |
| 62. |
Which of the following has the longest wave length ? |
| A. | ultraviolet radiation |
| B. | y - radiation |
| C. | visible radiation |
| D. | infra red radiation |
| Answer» E. | |
| 63. |
Which electromagnetic radiation is emitted by radioactive substances |
| A. | y - rays |
| B. | Radio waves |
| C. | micro waves |
| D. | x - ray |
| Answer» B. Radio waves | |
| 64. |
Which is one of the correct sequences of wavelength of radiations? |
| A. | UV > Green > In > Hard X - rays |
| B. | IR > Green > UV > Hard X - rays |
| C. | UV > Hard X - rays > In > Green |
| D. | IR > Hard X - rays > Green > UV |
| Answer» C. UV > Hard X - rays > In > Green | |
| 65. |
Which of the following waves can propagate in a vacuum ?1. Radio waves2. Light waves 3. X - rays4. Ultrasonic wavesSelect the correct answer using codes given belowCodes: |
| A. | 1, 2 and 3 |
| B. | 1, 2, 3 and 4 |
| C. | 2, 3 and 4 |
| D. | 1 and 4 |
| Answer» B. 1, 2, 3 and 4 | |
| 66. |
In a given atom, no two electrons can have the same value for all four quantum number. This is called |
| A. | Hund's rule |
| B. | Pauli's exclusion principle |
| C. | Uncertainty principle |
| D. | Aufbau's principle |
| Answer» C. Uncertainty principle | |
| 67. |
Electromagnetic radiation with maximum wavelength is |
| A. | ultraviolet |
| B. | radio waves |
| C. | X - rays |
| D. | infrared |
| Answer» C. X - rays | |
| 68. |
The particle with 13 protons and 10 electrons is |
| A. | AI - atom |
| B. | AI |
| C. | ion |
| D. | nitrogen isotope |
| E. | none of these |
| Answer» C. ion | |
| 69. |
Species containing same number of electrons are called |
| A. | Isotopes |
| B. | Isobars |
| C. | Isoelectronic |
| D. | Isotones |
| Answer» D. Isotones | |
| 70. |
Na+ ion is iso electronic with |
| A. | Li |
| B. | Mg |
| C. | Ca |
| D. | Ba |
| Answer» C. Ca | |
| 71. |
Which of the following atom contains the least number of neutrons |
| A. | U |
| B. | U |
| C. | U |
| D. | Np |
| Answer» B. U | |
| 72. |
Neutrino has |
| A. | charge +1, amss 1 |
| B. | charge 0, mass 0 |
| C. | charge -1, mass 1 |
| D. | charge 0, mass 1 |
| Answer» C. charge -1, mass 1 | |
| 73. |
The fundamental particles present in equal numbers in neutral atoms are |
| A. | protons and electrons |
| B. | neutrons and electrons |
| C. | protons and neutrons |
| D. | protons and positrons |
| Answer» B. neutrons and electrons | |
| 74. |
The absolute value of charge on electron was determined by |
| A. | J.J. Thomson |
| B. | R.A. Millikan |
| C. | Rutherford |
| D. | Chadwick |
| Answer» C. Rutherford | |
| 75. |
Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and C-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. | |
| 76. |
Which of the ions is not having the configuration of Ne ? |
| A. | CI |
| B. | F |
| C. | Na |
| D. | Mg |
| Answer» B. F | |
| 77. |
Rydberg' s constant for hydrogen line is |
| A. | 109678 cm |
| B. | 109.678 cm |
| C. | 1096.78 cm |
| D. | 10.9678 cm |
| Answer» B. 109.678 cm | |
| 78. |
Match colunm-I and column-IIColumn-IColumn-IIA.Thomson model1.Dual nature of electronB.Rutherford model2.Nuclear theoryC.Bohr's model3.Plum pudding modelD.de-Broglie theory4.Concept of quantization of energy |
| A. | A-3, B-4, C-2, D-1 |
| B. | A-2, B-4, C-1, D-2 |
| C. | A-2, B-1, C-3, D-4 |
| D. | A-3, B-2, C-4, D-1 |
| Answer» E. | |
| 79. |
The maximum number of electrons on a principle shell is |
| A. | n |
| B. | n |
| C. | 2n |
| D. | 3n |
| Answer» D. 3n | |
| 80. |
11H is also known as |
| A. | Deutarium |
| B. | Tritium |
| C. | Protium |
| D. | None of these |
| Answer» D. None of these | |
| 81. |
The electronic configuration of atom / ion can be defined by which of the following ? |
| A. | Aufbau principle |
| B. | Pauli's exclusion principle |
| C. | Hund's rule |
| D. | All of the above |
| Answer» E. | |
| 82. |
The power of an atom to attract a shared pair of electron is called? |
| A. | Electron affinity |
| B. | Electronegativity |
| C. | Ionization potential |
| D. | Electropositivity |
| Answer» C. Ionization potential | |
| 83. |
Alpha-particles are fast moving |
| A. | Hydrogen atoms |
| B. | Electrons |
| C. | Helium nuclei |
| D. | Protons |
| Answer» D. Protons | |
| 84. |
The value of plank's constant is? |
| A. | 6.626 X 1034 Js |
| B. | 6.024 X 1023 Js |
| C. | 6.626 X 1034 Js |
| D. | 1.667 X 1028 Js |
| Answer» D. 1.667 X 1028 Js | |
| 85. |
The value of Redberg's constant (RH) is? |
| A. | 1.09678 cm-1 |
| B. | 109678 cm-1 |
| C. | 109678 cm |
| D. | 1.09678 cm |
| Answer» C. 109678 cm | |
| 86. |
Lyman series of spectral lines appear in the ____ portion of spectrum. |
| A. | Ultraviolet |
| B. | Infra red |
| C. | Visible |
| D. | All of above |
| Answer» B. Infra red | |
| 87. |
Electronegativity of fluorine is arbitrarily fixed as? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 88. |
If a beam of sunlight is passing through the prism, then the type of spectrum obtained is? |
| A. | Continuous spectrum |
| B. | Line absorption spectrum |
| C. | Line emission spectrum |
| D. | Band spectrum |
| Answer» B. Line absorption spectrum | |
| 89. |
The energy released when an electron is added to an atom is the gaseous state is called? |
| A. | Electron affinity |
| B. | Ionization potential |
| C. | Electronegativity |
| D. | Electropositivity |
| Answer» B. Ionization potential | |
| 90. |
P–Orbitals are ________ in shape? |
| A. | Spherical |
| B. | Dumb bell |
| C. | Diagonal |
| D. | Linear |
| Answer» C. Diagonal | |
| 91. |
The energy required to remove electron from an atom in gaseous state is called? |
| A. | Electronegativity |
| B. | Electron affinity |
| C. | Ionization energy |
| D. | Electropositivity |
| Answer» D. Electropositivity | |
| 92. |
An element has 18 electrons, and 20 .neutrons. Its charge is –2. What is its mass number? |
| A. | 38 |
| B. | 39 |
| C. | 32 |
| D. | 40 |
| Answer» E. | |
| 93. |
Neutron is a fundamental particle which carries? |
| A. | No charge and mass of one unit |
| B. | A charge of +1 and mass of l unit |
| C. | A charge —1 unit and no mass. |
| D. | No charge and no mass. |
| Answer» B. A charge of +1 and mass of l unit | |
| 94. |
Which one of the following is not a strong bond? |
| A. | Metallic bond |
| B. | Ionic bond |
| C. | Covalent bond |
| D. | van der Waals bond |
| Answer» E. | |
| 95. |
The maximum number of. electrons that can be accommodated by p — orbital is? |
| A. | 6 |
| B. | 14 |
| C. | 2 |
| D. | 10 |
| Answer» B. 14 | |
| 96. |
The value of magnetic quantum number of the last electron of Na is? |
| A. | 0 |
| B. | 2 |
| C. | 1 |
| D. | 3 |
| Answer» B. 2 | |
| 97. |
Mean distance between atoms in the range of |
| A. | 25 nm |
| B. | 2.5 nm |
| C. | 0.28nm |
| D. | 0.025 nm |
| Answer» D. 0.025 nm | |
| 98. |
Neutrons were discovered by? |
| A. | J.J. Thomson |
| B. | Faraday |
| C. | Dalton |
| D. | Chadwick |
| Answer» E. | |
| 99. |
Atomic mass of an element is equal to the sum of? |
| A. | Electron and proton |
| B. | None of the above |
| C. | Proton and neutron |
| D. | Electron and neutron |
| Answer» D. Electron and neutron | |
| 100. |
Particles that most effects material properties |
| A. | Neutrons |
| B. | Electrons |
| C. | Protons |
| D. | Valence electrons |
| Answer» E. | |