1) Balance the chemical equation: CI2 + H2O -> HCIO3 + HCI a) CI2 + H2O -> HCIO3 + HCI b) 2CI2 + 2H2O -> HCIO3 + 2HCI c) 2CI2 + H2O -> HCIO3 + HCI d) CI2 + 2H2O -> HCIO3 + 2HCI 2) What is the mole fraction of CuCI2 in a solution prepared by dissolving 0.30 mol of CuCI2 in 40.0 mol of water? a) 0.0073 b) 0.0076 c) 0.0074 d) 0.0075 3) What is the definition of an isotope? a) Atoms with the same number of protons and neutrons b) Atoms with the same number of neutrons but different number of protons c) Atoms with different number of protons and neutrons d) Atom with the same number of protons but different number of neutrons 4) What is the definition of molarity in a solution? a) The number of moles of solute in 1L of solution b) The mass of solute per mass of solution c) The volume of solute per volume of solution d) The mass of solute in 1L of solution 5) Select the compound in which sulphur has the highest oxidation number a) SO2 b) SCI2 c) H2SO3 d) NaSO4 6) Balance the chemical equation in basic medium: Cr(OH)3 + CI2 -> CrCI3 + CIO2 + H20 a) Cr(OH)3 + 3CI2 -> CrCI3 + CIO2 + H2O b) 3Cr(OH)3 + 2CI2 -> 3CrCI3 + CIO2 + 3H2O c) 2Cr(OH)3 + 3CI2 -> 2CrCI3 + CIO2 + 2H20 d) Cr(OH)3 + 2CI2 -> CrCI3 + CIO2 + H20

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