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
(type the ones that are reactions) 25 points

Answer 1

2Al + 6HCl = 2AlCl3 + 3H2

Answer 2

Reaction examples for single displacement reaction

• The type of reaction in which product is formed by displacement of one element between the reactants, it is called as single displacement reaction.
• Among the series of reaction given in the question, the following reactions are considered as a single displacement:

1. $SnO_2+2H_2\rightarrow Sn+2H_2O$: As $H_2$ has replaced Sn in $SnO_2$.
2. $2Al+6HCl\rightarrow 2AlCl_3+3H_2$: As Al has replaced H in HCl.

• The reaction type to which other chemical reactions belong to are as follows:

1. $2NaBr+CaF_2\rightarrow 2NaF+CaBr_2$

• Double displacement reaction because 2 elements are getting replaced and lead to product formation.

2. $4Na+O_2\rightarrow 2Na_2O$

• Combination reaction because two different reactants are combining to yield the product.

3.  $2KClO_3\rightarrow 2KCl+3O_2$

• Decomposition reaction because one reactant is getting decomposed and yields two products.

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