Question

Which reactions are single displacement reactions? 2NaBr + CaF2 → 2NaF + CaBr2 SnO2 + 2H2 → Sn + 2H2O 4Na + O2 → 2Na2O 2KClO3 → 2KCl + 3O2 2Al + 6HCl → 2AlCl3 + 3H2

Answer 1

B,E

Step-by-step explanation:

Answer 2

Answer : The correct options are,
`SnO_2+2H_2\rightarrow Sn+2H_2O` and
`2Al+6HCl\rightarrow 2AlCl_3+3H_2`

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 :
`2NaBr+CaF_2\rightarrow 2NaF+CaBr_2`

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 :
`SnO_2+2H_2\rightarrow Sn+2H_2O`

It is an example of single displacement reaction.

Option C reaction :
`4Na+O_2\rightarrow 2Na_2O`

It is an example of combination reaction because in this reaction two reactants react to give a single product.

Option D reaction :
`2KClO_3\rightarrow 2KCl+3O_2`

It is an example of decomposition reaction because in this reaction a single reactant decomposes into two or more products.

Option E reaction :
`2Al+6HCl\rightarrow 2AlCl_3+3H_2`

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.