question_answer 46)

  Which of the following are combination reactions? (i)                                   (ii) (iii)                                           (iv) (a) Both (i) and (iii)                                                          (b) Both (iii) and (iv) (c) Both (ii) and (iv)                                                         (d) Both (ii) and (iii)                

Answer:

  (d) A reaction in which two or more reactants react together to form a single product, is called a combination reaction. In reaction (ii), andcombine to form,and in reaction (iii), Al and O2 combine to form. Reaction (i) is decomposition reaction and reaction (iv) is displacement reaction.