Question

The reaction $2Na(s)+C{{l}_{2}}(g)\to 2NaCl(s)$ is an example of:
A.Combination reaction
B.Decomposition reaction
C.Displacement reaction
D.Double displacement reaction

Answer 1

Hint: Before answering this question, we should know what is a combination reaction. It is the combination of two or more elements to form one compound, this reaction is known as a combination reaction. When a metal and a non-metal react in a combination reaction, the product which is formed is an ionic solid. The product that is formed is electrically neutral.

Complete answer:
A combination reaction is a reaction in which there are two or more elements or reactants that combine to form a single compound i.e product. These reactions are also known as synthesis reactions. They are represented by equations in the following manner: $X+Y\to XY$.
$2Na(s)+C{{l}_{2}}(g)\to 2NaCl(s)$

So, Option (A) Combination reaction is correct.

Additional information:
We can say that the reaction which is given is also an example of a redox reaction.
The oxidation number of Sodium (Na) increases from 0 on the reactant’s side to +1 on the product’s side which shows the sodium is being oxidized.
On the other side, the oxidation number of chlorine decreases from 0 on the reactant’s side to -1 on the product’s side which means chlorine is getting reduced.
$2Na(s)+C{{l}_{2}}(g)\to 2NaCl(s)$

Note:
Reduction/Oxidation reactions also known as Redox reactions are the reactions in which one of the reactants is getting oxidized and another one is getting reduced. To balance redox reactions is much more difficult than to balance the standard chemical equations. The basic difference between balancing them is that we use the half Equation method in the redox reaction. We divide the equation into two parts. one performs oxidation, other performs reduction.