Practice_Test_5 - PracticeTest5 1.

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Practice Test 5 1. Choose the statement(s) that is/are true about Rutherford’s alpha scattering experiment. (i) Most of the alpha particles suffered very little deviation while passing through the gold foil. (ii) Most of the alpha particles suffered significant deviation while passing through the gold foil. (iii) A few particles were deflected through large angles. (iv) Only a few particles passed through the gold foil. a. (i) only b. (i) and (iii) only c. (ii) and (iv) only d. (iii) and (iv) only 2. Choose the statement(s) that is/are true about the nuclear force. nuclear forces are responsible for holding the nuclear particles together. nuclear force is short ranged. nuclear force is weaker than electric force. (iv) nuclear force act through long distance. d. (i) and (ii) only 3. Choose the correct representation(s) that is/are used for carbon 12 atom. 12 6 C 12 C C 6 (iv) C 6 (i), (ii) and (iii) only d. 4. Choose the statement(s) that is/are true about the isotopes of an element isotopes have same atomic number but different mass number. isotopes have same mass number but different atomic number. all isotopes of an element have the same mass number
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(iv) all isotopes of an element have the same number of protons in the nucleus. a. (i) only b. (i) and (iii) only c. (i) and (iv) only d. (i) and (ii) only 5. How many neutrons are there in the nucleus of 238 92 ? U 238 330 146 d. 92 6. How many protons are there in the nucleus of 238 92 ? U d. 7. How many nucleons are there in the nucleus of 238 92 ? U d. 8. Choose the statement(s) that is/are true about Bohr model of the atom. (i) electrons orbit the nucleus in fixed energy levels where they will not radiate energy. (ii) The energy of an electron in an orbit depends on the radius of the orbit. (iii) An atom is stable when its electrons occupy orbits of the lowest possible energy. (iv) An electron in an outer orbit has greater energy than an electron in an inner orbit. (i), (ii), (iii) and (iv) d. (i), (ii) and (iii) only 9. Choose the statement(s) that is/are true about the isotopes of an element
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(i) isotopes have same atomic number but different mass number. (ii) isotopes have same mass number but different atomic number. (iii) all isotopes of an element have the same mass number (iv) all isotopes of an element have the same number of protons in the nucleus. a. (i) only b. (i) and (iii) only c. (i) and (iv) only d. (i) and (ii) only 10. According to the Bohr model of the atom, what is the radius of the orbit of the ground state electron in a hydrogen atom? 0.0529 nm 0.0838 nm 0.0053 nm d. 5.297 nm 11. electron in an orbit corresponding to the principal quantum number n = 3? 0.4761 nm 0.5689 nm d. 0.1587 nm 12. According to the Bohr model of the atom, what is the speed of the ground state electron in a hydrogen atom? 8.38 × 10 6 m.s -1 5.29 × 6 2.19 × 6 d. 1.29 × 6 -1 13. According to the Bohr model of the atom, what is the energy of the ground state -13.62 eV 13.62 eV -3.405 eV d.
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Practice_Test_5 - PracticeTest5 1.

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