1) Which of the following reactions involves the combination of two elements? a) SO2 + 1 O2 --> SO3  b) (b) 4Na + O2 --> 2Na2O c) (a) CaO+ CO2 --> CaCO3 d) NH3 + HCl " NH4Cl 2) Which of the following is a physical change? a) Formation of curd from milk b) Ripening of fruits c) Getting salt from sea water d) Burning of wood 3) C6H12O6 + O2 --> CO2 + H2O which statement is true about this reaction a) C6H12O6 + O2  are the products  b) C6H12O6 + O2 are mixtures  c) CO2 + H2O are reactants  d) CO2 + H2O are products 

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