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question_answer1) Which of the following is true according to Dalton's atomic theory? (a) Matter consists of small indivisible particles called atoms. (b) Atoms of same element are alike in all respects. (c) Atoms combine in small whole numbers to form compound atoms (molecules). (d) Atom is the smallest unit of matter which takes part in a chemical reaction.
question_answer2) Which of the following is not true according to modem atomic theory? (a) Matter consists of small indivisible particles called atoms. (b) Atoms of same element are alike in all respects. (c) Atoms combine in small whole numbers to form compound atoms (molecules). (d) Atom is the smallest unit of matter which takes part in a chemical reaction.
question_answer3) Which of the following is true according to modem atomic theory? (a) Atom is no more indivisible. (b) All atoms of same element are not always similar. (c) Atom is not the smallest particle that takes part in chemical reaction. (d) Atoms of different elements are different in all respects
question_answer4) What can be concluded from the constancy of e/m ratio?
question_answer5) What is the pressure and voltage at which cathode rays are produced?
question_answer6) Find the number of protons whose mass is equal to I S.I unit of mass.
question_answer7) Write charge and mass of electron, proton and neutron.
question_answer8) Does the mass and charge on positive rays remain same with the change in nature of gas in a discharge tube?
question_answer9) Name the gas that produces positive rays consisting only protons.
question_answer10) The specific charge for positive rays is much less, than the specific charge for cathode rays. Explain.
question_answer11) What is the e/m ratio of a neutron?
question_answer12) How did Rutherford explain the stability of the atom?
question_answer13) What are the drawbacks of Rutherford's atomic model?
question_answer14) J.J Thomson's atomic model is also called (a) Water melon model (b) Apple pie pudding model (c) Nuclear model (d) Solar model
question_answer15) What are the other names for Rutherford's atomic model?
question_answer16) Rutherford's atomic model is also called nuclear model and solar model. Give reason.
question_answer17) What was the purpose of ZnS in Rutherford's gold foil experiment?
question_answer18) What is the composition of \[\alpha \]- rays?
question_answer19) Name the scientist who predicted the presence of neutrons inside the nucleus.
question_answer20) Name the scientist who introduced the concept of orbits.
question_answer21) What are the names given by Neils' Bohr to different orbits of an atom?
question_answer22) Why are Bohr's orbits called Stationary orbits?
question_answer23) Theoretically, the number of orbits that are possible for the electron to revolve in fixed paths is: (a) 10 (b) \[\text{1}{{0}^{\text{1}0}}\] (c) \[\text{1}{{0}^{\text{1}00}}\] (d) infinite
question_answer24) Can an electron shift its position from one orbit to another? If so, how?
question_answer25) What is the energy of 'n' quanta whose frequency is 'y'?
question_answer26) An electron jumping from a higher orbit to a lower orbit radiates energy in the form of electromagnetic radiations containing photons. If \[{{E}_{2}}\]and \[{{E}_{1}}\]are the energies of higher and lower orbits, respectively, find the frequency of radiation.
question_answer27) If 'n' is the no. of photons needed to generate an energy equivalent to 'E', find the wave length of each photon.
question_answer28) Find the total energy equivalent to 1000 photons whose wavelength is\[\text{1}{{0}^{\text{6}}}{{A}^{0}}\].
question_answer29) Calculate the ratio of energies of two radiations whose wavelengths are \[\text{6}000\,{{\text{A}}^{0}}\] and \[\text{12}000\,{{\text{A}}^{0}}\]respectively.
question_answer30) Find the wavelength of a photon whose energy is equal to 931.5 MeV (MeV is million electro volt and \[\text{1eV}=\text{1}.\text{6}0\text{2}\times \text{1}{{\text{0}}^{-19}}J\])
question_answer31) The atomic mass of lead is 208 and its atomic number is 82. The atomic mass of bismuth is 209 and its atomic number is 83. The ratio of neutrons/protons in the atom (a) higher of Pb (b) higher of Bi (c) same of both (d) None of these
question_answer32) Atomic number is always equal to the number of electrons present in an atom. True / False. Explain.
question_answer33) Identify the element whose atomic number and mass number are same.
question_answer34) The atoms of all the elements contain electrons, protons and neutrons. True / False. Explain.
question_answer35) Name a few elements whose mass number is double their atomic numbers.
question_answer36) The mass number of an element is 23 and atomic number is 11. Find the number of protons, electrons and neutrons respectively present in the atom.
question_answer37) Why does atomic number not change during a chemical reaction?
question_answer38) The mass number of an element is 52 and its atomic number is 24. Find the number of electrons, protons and neutrons in an atom of this element.
question_answer39) Which of the following statements is not correct about calcium atom? (a) The number of electrons is same as the number of neutrons. (b) The number of nucleons is double the number of electrons. (c) The number of protons is half the number of neutrons (d) The number of nucleons is double the atomic number.
question_answer40) If three neutrons are added to the nuclei of\[_{92}^{235}U\]the new particle will have an atomic number of (a) 89 (b) 95 (c) 90 (d) 92
question_answer41) Write the electronic configuration of the following elements: (i) \[_{17}^{35}Cl\] (ii) \[_{6}^{12}C\] (iii) \[_{19}^{39}K\] (iv) \[_{15}^{31}P\]
question_answer42) The electronic configuration 2, 8, 8, 2 represents the element (a) Argon (b) Potassium (c) Calcium (d) Chlorine
question_answer43) Write the electronic configuration of \[M{{g}^{2+}}\]and \[C{{l}^{-}}\]
question_answer44) An element has 2 electrons in the M shell. What is the atomic number of the element?
question_answer45) Find the number of 'M' electrons in \[_{13}A{{l}^{27}}\]
question_answer46) The isotopes have : (a) same mass number (b) same valency (c) same number of protons (d) same number of electrons
question_answer47) Which of the following is true for isotopes? (a) They have same mass number (b) They have same number of protons (c) They have same number of neutrons (d) Both (a) and (b)
question_answer48) Most elements have fractional atomic masses because (a) they have isotopes (b) their isotopes have different masses (c) their isotopes have non-integral masses (d) the constituent neutrons, protons and electrons combine to give fractional masses.
question_answer49) Species Protons Neutrons Electrons A 17 18 17 B 17 20 17 A and B are: (a) Isotopes (b) Isobars (c) Isotones (d) None
question_answer50) Isotopes have : (a) Similar chemical properties .and physical properties. (b) Dissimilar chemical properties and physical properties. (c) Similar chemical properties and dissimilar physical properties. (d) Similar physical properties and dissimilar chemical properties.
question_answer51) Which of the following statements is not correct? (a) Isotones are atoms of different elements having same number of neutrons. (b) Isotopes are atoms of different elements having same number of nucleons. (c) Isobars are atoms of different elements having same number of nucleons. (d) Isotones and isobars are atoms of different elements.
question_answer52) An isotone of \[_{32}^{76}Ge\]is (a) \[_{32}^{77}Ge\] (b) \[_{33}^{77}As\] (c) \[_{34}^{77}Se\] (d) \[_{36}^{81}Kr\]
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