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Multiple Choice Question For Practice: 1. Some Basic Concept Of Chemistry. 1. The phlogiston theory was suggested for     a) neutralization reaction  b) oxidation reaction     c) reduction reaction          d) combustion reaction 2 . Atom is the smallest particle of     a) compound                       b) substance     c) mixture                             d) element 3 . Molecule is the smallest particle of     a) compound                       b) substance     c) mixture ...