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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is an atom? |
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Answer» An atom is defined as the smallest particle of a molecule which is further subdivided into electrons, protons and neutrons. |
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| 52. |
Give the following a suitable word/phrase.(a) The sub-atomic particle with negative charge and negligible mass.(b) Protons and neutrons present in the nucleus.(c) The electrons present in the outermost shell.(d) Arrangement of electrons in the shells of an atom.(e) The number of protons present in the nucleus of an atom.(f) The sum of the number of protons and neutrons of an atom.(g) Atoms of same element with same atomic number but a different mass number.(h) The smallest unit of an element which takes part in a chemical reaction. |
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Answer» (a) Neutron (b) Mass number (c) Valency (d) Orbits or Valence shells (e) Atomic number (f) Mass number (g) Isotopes (h) Atom |
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| 53. |
In all atoms of an element – (a) the atomic and the mass number are same. (b) the mass number is same and the atomic number is different. (c) the atomic number is same and the mass number is different (d) both atomic and mass numbers may vary |
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Answer» (a) the atomic and the mass number are same. |
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| 54. |
Write ‘true’ or ‘false’ for the following statements:(a) An atom on the whole has a positive charge.(b) The maximum number of electrons in the first shell can be 8.(c) The central pad of the atom is called nucleus. |
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Answer» 1. False 2. False 3. True |
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| 55. |
MATCH THE COLUMNSColumn AColumn B1. John Dalton(a) Neutrons2. Atom(b) Model of the atom3. Chadwick(c) The atomic Theory of matter4. Rutherford(d) Positively charged5. Protons(e) Electrically neutral6. Nuclear fusion(f) High penetrating power7. Gamma-rays(g) Energy in sun |
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| 56. |
Which of the following statements made by Dalton has not undergone any change? (a) Atoms cannot be broken.(b) Atoms combine in small, whole numbers to form compounds. (c) Elements are made up of atoms.(d) All atoms of an elements are alike |
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Answer» (d) All atoms of an elements are alike |
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| 57. |
Fill in the blanks.(a) Dalton............ that atoms could not be divided(b) An ion which has a positive charge is called a............. (c) The outermost shell of an atom is known as................ (d) The.................. of an atom is very hard and dense.(e) Neutrons are............... particles having mass equal to that of protons.(f) Isotopes are the atoms of................ element having the same atomic number but a different mass number. |
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Answer» (a) Dalton said that atoms could not be divided (b) An ion which has a positive charge is called a cation. (c) The outermost shell of an atom is known as valence shell. (d) The nucleus of an atom is very hard and dense. (e) Neutrons are neutral particles having mass equal to that of protons. (f) Isotopes are the atoms of an element having the same atomic number but a different mass number. |
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| 58. |
Name the four laws of chemical combinations. |
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Answer» 1. Law of conservation of mass 2. Law of constant proportion 3. Law of multiple proportion 4. Gay Lussac’s law of gaseous volumes. |
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| 59. |
Metals form ………(a) anions (b) cations (c) both a and b (d) none |
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Answer» Metals form cations |
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| 60. |
What is the valency of carbon? (a) 1 (b) 2 (c) 3 (d) 4 |
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Answer» The valency of carbon is 4 |
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| 61. |
What is a chemical equation? |
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Answer» A chemical equation is a short hand representation of a chemical reaction with the help of chemical symbols and formula. |
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| 62. |
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its1. mass number2. atomic number3. number of electrons4. all of the above |
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Answer» The sum of the number of protons and the number of neutrons present in the nucleus of an atom is called its mass number |
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| 63. |
Nucleus of an atom has 6 protons and 8 neutrons. Calculate at. no., mass no. and no. of electrons in neutral atom. What is the symbol of atom? |
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Answer» At. no. of element (Z) = number of protons Z = 6 Mass no. of element (A) = no. of protons + no. of neutrons = 6 + 8 A = 14 no. of electrons in neutral atom = 6 Symbol of element = 6C14 |
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| 64. |
Why two or more atoms combine to form molecules ? |
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Answer» A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water. |
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| 65. |
Name the isotopes of hydrogen. |
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Answer» There are 3 (three) isotopes of hydrogen 1. Protium 1H1 2. Deuterium 1H2 3. Tritium 1H3 |
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| 66. |
Write the properties of anode rays. |
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Answer» Properties of Anode rays: 1. Anode rays travel in straight lines. 2. Anode rays are made up of material particles. 3. Anode rays are deflected by electric and magnetic fields. Since, they are deflected towards the negatively charged plate, they consist of positively charged particles. |
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| 67. |
Define valency of an element with respect to hydrogen. |
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Answer» Valency of an element is defined as the number of hydrogen atoms which combine with one atom of it. |
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| 68. |
Which one orbital has e-density on the axis.(a) dxy(b) dyz(c) dxz(d) dx2-y2 |
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Answer» The correct answer is (d) dx2-y2. |
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| 69. |
Some known objects are shown, also the broken particles of the objects are shown. Name the articles or objects you see here? Also try to write What each of it made of? |
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Answer» 1. Hummer made of Iron 2. Bangles made of glass 3. Tap made of steel 4. Vessels made of Aluminum or steel |
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| 70. |
Why are atomic numbers and mass numbers are always whole numbers ? |
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Answer» 1. The atomic number is always a whole number because there must always be a whole number of protons in a nucleus. In other words there can never exist fractions of a proton. 2. The atomic mass number is always a whole number for the same reason. Protons and neutrons always come in single units not in fractions. |
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| 71. |
A sulphur atom contains 16 Protons and 16 neutrons. Give its atomic number and atomic mass number. |
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Answer» Atomic number of Sulphur = No.of proton sulpher = 16 Atomic mass number of Sulphur = No. of Protons + No. of Neutrons = 16 + 16 = 32 |
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| 72. |
Assertion and reason.Assertion : The number of protons and neutrons is atomic number. Reason : The mass number is sum of protons and neutrons. |
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Answer» Assertion is false but the reason is true statement. Correct statement: The number of protons and neutrons is mass number. |
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| 73. |
Complete the analogy. 1. Sun: Nucleus, planets: ______ 2. Atomic number: ______ , Mass number: number of protons and neutrons. 3. K: Potassium, C: ______. |
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Answer» 1. electrons 2. Number of protons 3. Carbon |
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| 74. |
What are the limitations of Thomson’s model of an atom? |
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Answer» J. J. Thomson’s theory does not propose anything about the positive and negative charges of an atom. Hence , it was not able to explain many of the properties of substances. |
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| 75. |
Name the 3 sub-atomic particles of an atom |
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Answer» Electron, Proton, Neutron. |
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| 76. |
__________ Nucleons comprises of (a) Protons and electrons (b) Neutrons and electrons (c) Protons and neutrons (d) Neutrons and Positron |
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Answer» (c) Protons and neutrons |
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| 77. |
J.J Thomson’s atom model is also called as ________ (a) Plum pudding model (b) gold foil (c) alpha particle (d) none |
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Answer» (a) Plum pudding model |
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| 78. |
What are nucleons? |
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Answer» Protons and neutrons reside in the nucleus of an atom and are thus called nucleons. |
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| 79. |
How Rutherford’s model is different from that proposed by J.J. Thomson? |
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Answer» According to Rutherford, most of the mass is concentrated is a small central part of the atom whereas J.J. Thomson thought that mass was uniformly distributed in the atom. |
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| 80. |
Fill in the blanks :1. ______ is the smallest particle of a chemical element. 2. The ______ are combination of atoms of various elements or the same element. 3. According to John Dalton, atom is a hard, solid, ball and it is ______ 4. ________ compared an atom to a watermelon. 5. The particles that make up the atom are called _________ particles. |
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Answer» 1. Atom 2. molecules 3. indivisible 4. J.J. Thomson 5. sub-atomic |
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| 81. |
What is the characteristics of proton? |
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Answer» The proton is the positively charged particle and its located in the nucleus. Its positive Charge is of the same magnitude as that of the electron’s negative charge. |
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| 82. |
Protons and neutrons are called ________ (a) atom (b) nucleons (c) positive charge (d) negative charge |
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Answer» Correct answer is (b) nucleons |
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| 83. |
Is the structure of the atom the same as the structure of the solar system. |
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Answer» Yes It is similar to the solar system. It has a core center called nucleus and it has paths called orbits around the nucleus. |
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| 84. |
What is an electron? |
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Answer» It is negatively charged particle, which revolve around the nucleus of the atom is specific orbits. |
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| 85. |
What is the mass of a proton? |
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Answer» 1.6726 x 10-27 kg. |
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| 86. |
Proton was discovered by ________ (a) Rutherford (b) Goldstein (c) Chadwick (d) J.J. Thomson |
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Answer» Correct answer is (a) Rutherford |
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| 87. |
Explain the following terms. Proton Electron Neutron. |
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Answer» 1. Proton (p): The proton is the positively charged particle and is located in the nucleus. Its positive charge is of the same magnitude as that of the electron’s , negative charge. 2. Neutron (n): Neutron is inside the nucleus. The neutron does not have any charge. Except hydrogen (protium), the nuclei of all atoms contain neutrons. 3. Electron (e): This is a negatively charged particle. Electrons revolve around the nucleus of the atom in specific orbits. The mass of an electron is negligible as compared to that of a proton or neutron. |
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| 88. |
__________ is positively charged. (a) Proton (b) Electron (c) Molecule (d) Neutron |
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Answer» Correct answer is (a) Proton |
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| 89. |
Among the following the odd pair is …………(a) 188O ,37 7Cl (b) 4018Ar ,14 7N (c) 3014Si ,3115P(c) 5424Cr ,3919K |
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Answer» (b) 4018Ar ,14 7N |
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| 90. |
The subatomic particle revolve around the nucleus is __________ (a) Atom (b) Neutron (c) Electron (d) Proton |
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Answer» Correct answer is (c) Electron |
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| 91. |
Fill in the Blanks. 1. Calcium and Argon are examples of a pair of ………2. Total Number of electrons that can be accommodated in an orbit is given by …………3. ……… isotope is used in the nuclear reactors. 4. The number of neutrons present in 73L is …………5. The valency of Argon is |
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Answer» 1. Isobars 2. 2n2 3. Radio 4. 4 5. 0 |
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| 92. |
The number of protons, neutrons and electrons present respectively in 35Br (a) 80, 80, 35 (b) 35, 55, 80 (c) 35, 35, 80 (d) 35, 45, 35 |
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Answer» (d) 35, 45, 35 |
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| 93. |
True or false / if false give the correct answer.1. In an atom, electrons revolve around the nucleus in fixed orbits2. Isotopes of an element have the different atomic numbers3. Electrons have negligible mass and charge4. Smaller the size of the orbit, lower is the energy of the orbit5. The maximum number of electrons in L shell is 10 |
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Answer» 1. True 2. False Correct Statement: Isotopes are atoms of the same element, which have same atomic number but different mass numbers. 3. False. 4. True 5. False. Correct Statement: The maximum number of electron in L shell is 8 |
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| 94. |
Compare the charge and mass of protons and electrons. |
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| 95. |
The correct electronic configuration of potassium is (a) 2,8,9 (b) 2,8,1 (c) 2,8,8,1 (d) 2,8,8,3 |
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Answer» (c) 2,8,8,1 |
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| 96. |
Write the electronic configuration of K and Cl. |
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Answer» Electronic configuration of K+ – 2, 8, 8 Cl- – 2, 8, 8 |
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| 97. |
Name an element which has the same number of electrons in its first and second shell. |
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Answer» Beryllium has the same number of electrons in its first and second shell. |
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| 98. |
Complete the following table.Atomic numberMass numberNumbers of NeutronsNumbers of ProtonsNumber of ElectronsName of the Element9-10---16-16----24--12Magnesium-2-1--11011- |
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| 99. |
Match the following.1. Dalton(a) Hydrogen atom model2. Thomson(b) Planetary model3. Rutherford(c) First atomic theory4. Neils Bohr(d) Plum pudding model(d) Discovery of neutrons |
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Answer» 1. (c) 2. (d) 3. (b) 4. (a) |
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| 100. |
Symbolically represent the following atoms using atomic number and mass number, 1. Carbon 2. Oxygen3. Silicon 4. Beryllium |
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Answer» 1. Carbon = 126C 2. Oxygen = 168O 3. Silicon = 2814S 4. Beryllium = 94Be |
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