Question

6.Which set of coefficients correctly balances the following chemical equation?___ Mg(OH)2 + ___ HCl Imported Asset ___ MgCl2 + ___ H2O
A. 1, 1, 1, 1
B. 1, 2, 1, 2
C. 1, 2, 2, 2
D. 2, 4, 2, 4

Answer 1

Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

B. 1, 2, 1, 2 

Answer 2

Answer: Option (B) is the correct answer.

Explanation:

A chemical reaction that contains same number of atoms on both reactant and product side is known as a balanced chemical equation.

For example, $Mg(OH)_{2} + HCl \rightarrow MgCl_{2} + H_{2}O$

Number of atoms on reactant side are as follows.

Mg = 1

O = 2

H = 3

Cl = 1

Number of atoms on product side are as follows.

Mg = 1

O = 1

H = 2

Cl = 2

Therefore, to balance this chemical equation we multiply HCl by 2 on reactant side and multiply $H_{2}O$ by 2 on product side.

Hence, we can conclude that the balanced chemical equation will be as follows.

             $Mg(OH)_{2} + 2HCl \rightarrow MgCl_{2} + 2H_{2}O$