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.
| 101. |
Electromagnetic radiations produced from nuclear reactions are? |
| A. | γ - rays |
| B. | x — rays |
| C. | β - rays |
| D. | α - rays |
| Answer» D. α - rays | |
| 102. |
Electron sea exists in |
| A. | Metallic bond |
| B. | Ionic bond |
| C. | Polar bonds |
| D. | Covalent bond |
| Answer» B. Ionic bond | |
| 103. |
The atomic diameter of an BCC crystal (if a is lattice parameter) is |
| A. | a/2 |
| B. | a/(4/√3) |
| C. | a |
| D. | a/(4/√2) |
| Answer» C. a | |
| 104. |
Miller indices for Octahedral plane in cubic crystal |
| A. | -110 |
| B. | -100 |
| C. | None |
| D. | -111 |
| Answer» E. | |
| 105. |
A family of directions is represented by |
| A. | (hkl) |
| B. | [uvw] |
| C. | {hkl} |
| Answer» D. | |
| 106. |
Atomic packing factor is |
| A. | Projected area fraction of atoms on a plane |
| B. | Distance between two adjacent atoms |
| C. | None |
| D. | Volume fraction of atoms in cell |
| Answer» E. | |
| 107. |
Schottky-defect in ceramic material is |
| A. | Vacancy- interstitial pair of cations |
| B. | Pair of nearby cation and anion vacancies |
| C. | Substitutional impurity |
| D. | Substitutional impurity |
| Answer» C. Substitutional impurity | |
| 108. |
Repeatable unit of polymers |
| A. | homopolymer |
| B. | copolymer |
| C. | isomer |
| D. | mer |
| Answer» E. | |
| 109. |
Pick the thermo-plast from the following |
| A. | Vinyls |
| B. | Epoxies |
| C. | Resins |
| D. | Vulcanized rubber |
| Answer» B. Epoxies | |
| 110. |
Coordination number in simple cubic crystal structure |
| A. | 3 |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 111. |
Bond strength of secondary bonds is in the range of |
| A. | 100 kJ/mol |
| B. | 1000 kJ/mol |
| C. | 10 kJ/mol |
| D. | 1 kJ/mol |
| Answer» D. 1 kJ/mol | |
| 112. |
Principle Quantum number describes? |
| A. | Spin of orbital |
| B. | Orientation of an orbital. |
| C. | Shape of orbital |
| D. | Size of orbital |
| Answer» E. | |
| 113. |
No two electrons in the same atom can have identical set of four quantum numbers. This statement is known as? |
| A. | Hund's rule |
| B. | Aufbaus rule |
| C. | (n + 1) rule |
| D. | Pauli's Exclusion principle |
| Answer» E. | |
| 114. |
The most electronegative element is? |
| A. | Florine |
| B. | Bromine |
| C. | Iodine |
| D. | Chlorine |
| Answer» B. Bromine | |
| 115. |
The nature of cathode rays were identified by? |
| A. | J.J. Thomson |
| B. | Hitiroff |
| C. | William Crook |
| D. | J. Perrin |
| Answer» B. Hitiroff | |
| 116. |
When α — particles are sent through a thin metal foil, most of them go straight through the foil because? |
| A. | α — particles are positively charged. |
| B. | All of above |
| C. | Most of the space is empty is an atom. |
| D. | α — particles moves with high velocity |
| Answer» D. α — particles moves with high velocity | |
| 117. |
An element has 18 electrons, and 20 .neutrons. Its charge is — What is its mass number? |
| A. | 40 |
| B. | 32 |
| C. | 38 |
| D. | 39 |
| Answer» B. 32 | |
| 118. |
Cathode rays are deflected by? |
| A. | Neither electric nor magnetic field. |
| B. | An electric field only. |
| C. | Both electric and magnetic field |
| D. | A magnetic filed only |
| Answer» D. A magnetic filed only | |
| 119. |
Anode rays were discovered by? |
| A. | J.J. Thomson |
| B. | J. Stoney |
| C. | Rutherford |
| D. | Goldstein |
| Answer» E. | |
| 120. |
Which of the following statement Is wrong about electron? |
| A. | It has wave like property |
| B. | Its motion is affected by magnetic field. |
| C. | It is a particle |
| D. | It emits energy while moving in orbit. |
| Answer» E. | |
| 121. |
The mass of electron as determined by J.J. Thomson is? |
| A. | 9.1 X 10-31 kg. |
| B. | 9.1 X 10-10gm |
| C. | 9.1 X 10-25 kg |
| D. | 9.1 X 10-18gm |
| Answer» B. 9.1 X 10-10gm | |
| 122. |
Quantum number value for 2p sub shell are? |
| A. | n = 2, L = 1 |
| B. | n = 1,L = 0 |
| C. | n = 1, L = 1 |
| D. | n = 2, L = 0 |
| Answer» B. n = 1,L = 0 | |
| 123. |
The absolute charge of an electron is___________. |
| A. | 6 x 10-19C |
| B. | 6 x 10-19 C |
| C. | 16 x 10-19C |
| D. | + 6 x 10-19C |
| Answer» C. 16 x 10-19C | |
| 124. |
The nature of positive rays depends on? |
| A. | The nature of discharge tube. |
| B. | The nature of residual gas |
| C. | The nature of electrode |
| D. | All of above. |
| Answer» C. The nature of electrode | |
| 125. |
when 6d orbital is complete, the entering electron goes into? |
| A. | 7p |
| B. | 7d |
| C. | 7f |
| D. | 7s |
| Answer» B. 7d | |
| 126. |
Which one of the following sets of quantum numbers(n,l,ml, ms) represents as impossible arrangement? |
| A. | 3,2,-2,1/2 |
| B. | 4,0,0,1/2 |
| C. | 5,3,0,-1/2 |
| D. | 3,2,-3,1/2 |
| Answer» E. | |
| 127. |
Any p-orbital can accommodate up to |
| A. | four electrons |
| B. | two electrons with opposite spins |
| C. | six electrons |
| D. | two electrons in parallel groups |
| Answer» D. two electrons in parallel groups | |
| 128. |
correct set of four quantum numbers forhte valence (outmost) electron of rubidium 9Z = 37) is: |
| A. | 6,0,0,+1/2 |
| B. | 5,1,0, +1/2 |
| C. | 5,0,0,+1/2 |
| D. | 5,1,1,+1/2 |
| Answer» D. 5,1,1,+1/2 | |
| 129. |
The heaviest particle among all the four given particles is? |
| A. | Meson |
| B. | Proton |
| C. | Neutron |
| D. | Electron |
| Answer» B. Proton | |
| 130. |
Most penetrating radiation of radioactive element is: |
| A. | x — rays |
| B. | β — rays |
| C. | α — rays |
| D. | γ — rays |
| Answer» E. | |
| 131. |
Bohr model can explain: |
| A. | spectrum of an atom or ion containing one electron only. |
| B. | the spectrum of hydrogen atom only |
| C. | the solar spectrum |
| D. | the spectrum o hydrogen molecule |
| Answer» B. the spectrum of hydrogen atom only | |
| 132. |
Carbon-12 atom has_______________. |
| A. | 6 electrons, 12 protons, 6 neutrons |
| B. | 6 electrons, 6 protons, 6 neutrons |
| C. | 12 electrons, 6 protons, 6 neutrons |
| D. | 18 electrons, 6 protons and 6 neutrons |
| Answer» C. 12 electrons, 6 protons, 6 neutrons | |
| 133. |
When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ____. |
| A. | protons |
| B. | neutrons |
| C. | unoccupied space |
| D. | deuterons |
| Answer» D. deuterons | |
| 134. |
Electron was discovered by___________. |
| A. | Goldstein |
| B. | Thomson |
| C. | Chadwick |
| D. | Bohr |
| Answer» C. Chadwick | |
| 135. |
Almost the entire mass of an atom is concentrated in the__________. |
| A. | electrons |
| B. | proton |
| C. | nucleus |
| D. | neutrons |
| Answer» D. neutrons | |
| 136. |
Energy of orbit. |
| A. | Increases as we move away from nucleus |
| B. | Decreases as we move away from nucleus |
| C. | Remains same as we move away from nucleus |
| D. | None of these |
| Answer» B. Decreases as we move away from nucleus | |
| 137. |
When electrons in an atom in an excited state fall to lower energy levels, energy is |
| A. | released, only |
| B. | absorbed, only |
| C. | both released and absorbed |
| D. | neither released nor absorbed |
| Answer» B. absorbed, only | |
| 138. |
The nucleus of helium contains |
| A. | Two neutrons and two protons |
| B. | Four protons |
| C. | Four neutrons |
| D. | Four protons and two electrons |
| Answer» D. Four protons and two electrons | |
| 139. |
A proton has approximately the same mass as |
| A. | an electron |
| B. | a neutron |
| C. | a beta particle |
| D. | an alpha particle |
| Answer» C. a beta particle | |
| 140. |
Which of the following statements does not form part of Bohr's model of the hydrogen atom. |
| A. | The electron in the orbit nearest the nucleus has the lowest energy |
| B. | Electrons revolve in different orbits around the nucleus |
| C. | Energy of the electrons in the orbit is quantized |
| D. | The position and velocity of the electrons in the orbit cannot be determined simultaneously |
| Answer» E. | |
| 141. |
Compared to the charge and mass of a proton, an electron has… |
| A. | the same charge and the same mass |
| B. | an opposite charge and the same mass |
| C. | the same charge and a smaller mass |
| D. | an opposite charge and a smaller mass |
| Answer» E. | |
| 142. |
Cathode rays are deflected towards__________. |
| A. | positive electrode |
| B. | both electrodes |
| C. | negative electrode |
| D. | none of the electrodes |
| Answer» B. both electrodes | |
| 143. |
The number of electrons in one molecule of are. |
| A. | 44 |
| B. | 44 |
| C. | 88 |
| D. | 22 |
| Answer» E. | |
| 144. |
the principal quantum number of an atom is related to the |
| A. | spin angular momentum |
| B. | orbital angular momentum |
| C. | orientation of the orbital in space |
| D. | size of the orbital |
| Answer» E. | |
| 145. |
An atom has a mass number of 23 and atomic number 1 The number of protons are_________. |
| A. | 23 |
| B. | 12 |
| C. | 44 |
| D. | 11 |
| Answer» E. | |
| 146. |
According to Bohr's Model, the radius of the second orbit is: |
| A. | 2.1 A° |
| B. | 2.11 X 10-11m |
| C. | 2A° |
| D. | 2.11 X 10-12 m |
| Answer» B. 2.11 X 10-11m | |
| 147. |
The value of Bohr radius for first orbit of H-atom is? |
| A. | 0.529 X 10-8 cm |
| B. | 0.529 X 10-12 cm |
| C. | 0.529 x 10-10 cm |
| D. | 0.529 X 10-6 cm |
| Answer» B. 0.529 X 10-12 cm | |
| 148. |
The orbits having same energy are called? |
| A. | Degenerated orbitals |
| B. | Valence orbitals |
| C. | P-Orbita1s. |
| D. | Hybrid orbitals |
| Answer» B. Valence orbitals | |
| 149. |
The shape of an orbital is governed by? |
| A. | Principle quantum number |
| B. | Spin quantum number |
| C. | Azimuthal quantum number |
| D. | Magnetic quantum number |
| Answer» D. Magnetic quantum number | |
| 150. |
The size of the shell Is determined by ____ quantum number. |
| A. | Spin quantum number. |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | Principle quantum number |
| Answer» E. | |