1) Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of a) electron b) proton c) nucleus in the atom d) atomic mass 2) Which of the following are true for an element? a) Atomic number = number of protons + number of electrons b) Mass number = number of protons c) Atomic mass = number of protons = number of neutrons d) Atomic number = number of protons = number of electrons 3) The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? a) 13 b) 10 c) 14 d) 16 4) Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively. a) b) c) d) 5) The first model of an atom was given by a) N. Bohr b)  E. Goldstein c)  Rutherford d) J.J. Thomson 6) Which of the following statement is always correct? a) An atom has equal number of electrons and protons. b) An atom has equal number of electrons and neutrons. c) An atom has equal number of protons and neutrons d) An atom has equal number of electrons, protons and neutrons. 7) Hydrogen isotope which has no neutron a) Deuterium b) Tritium c) Protium d) Chlotium 8) The chemical symbol for sodium is a) So b) Sd c) NA d) Na 9) Which of the following represents 12 u? a) Mass of 1 hydrogen atom b) Mass of C-12 atom c) Mass of 0-16 atom d) 1/12th of mass of C-12 atom. 10) The molecule having an atomicity of 4 is: a) Sulphate molecule b) Ozone molecule c) Phosphorus molecule d) Methane molecule 11) In a chemical reaction, the sum of the masses of the reactants and products remain unchanged. This is called …………… a) Law of constant proportion b) Law of conservation of mass c) Chemical combination d) None of the following 12) A group of atoms carrying a fixed charge on them is called ………….. a) Diatomic ion b) Ion c) Tetratomic ion d) Polyatomic ion 13) The atomic number of sodium is 11 and its mass number is 23. It has a)  11 neutrons and 12 protons b) 12 protons and 11 electrons c) 11 electrons and 12 neutrons d)  12 electrons and 11 neutrons 14) In an alpha scattering experiment, few alpha particles rebounded because a) Most of the space in the atom is occupied b) Positive charge of the atoms very little space c) The mass of the atom is concentrated in the centre d) All the positive charge and mass of the atom is concentrated in small volume 15) The electrons present in the outermost shell are called a) Valency electrons b) Octate electrons c)  Duplet electrons d)  Valence electrons

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