Respuesta :
Answer : The correct options are, [tex]SnO_2+2H_2\rightarrow Sn+2H_2O[/tex] and [tex]2Al+6HCl\rightarrow 2AlCl_3+3H_2[/tex]
Explanation :
Single displacement reaction : It is a type of chemical reaction in which the more reactive element displaces the less reactive element.
Option A reaction : [tex]2NaBr+CaF_2\rightarrow 2NaF+CaBr_2[/tex]
It is an example of double displacement reaction because in this reaction a positive cation and a negative anion of the two reactants exchange their places to form two new products.
Option B reaction : [tex]SnO_2+2H_2\rightarrow Sn+2H_2O[/tex]
It is an example of single displacement reaction.
Option C reaction : [tex]4Na+O_2\rightarrow 2Na_2O[/tex]
It is an example of combination reaction because in this reaction two reactants react to give a single product.
Option D reaction : [tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
It is an example of decomposition reaction because in this reaction a single reactant decomposes into two or more products.
Option E reaction : [tex]2Al+6HCl\rightarrow 2AlCl_3+3H_2[/tex]
It is an example of single displacement reaction because in this reaction the most react element, aluminium displaces the less reactive element, hydrogen.
Hence, the options B and E are single displacement reactions.
