Question

Which equation is balanced​

Answer 1

Answer : The balanced chemical equation will be:

$2Al+3F_2\rightarrow 2AlF_3$

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

Part 1 :

The given chemical reaction is,

$Mg+2O_2\rightarrow 2MgO$

This reaction is an unbalanced chemical reaction because in this reaction number of oxygen atoms are more in reactant side as compared to product side.

In order to balance the chemical equation, the coefficient '2' of $O_2$ removed from the reaction.

The balanced chemical reaction will be,

$Mg+O_2\rightarrow 2MgO$

Part 2 :

The given chemical reaction is,

$2Al+3F_2\rightarrow 2AlF_3$

This reaction is a balanced chemical reaction because in this reaction number of aluminum and fluorine atoms are balanced on both side of the reaction.

Part 3 :

The given chemical reaction is,

$Al+3O_2\rightarrow Al_2O_3$

This reaction is an unbalanced chemical reaction because in this reaction number of aluminium atoms are not balanced.

In order to balance the chemical equation, the coefficient '4' put before the $Al$ and the coefficient '2' put before the $Al_2O_3$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$4Al+3O_2\rightarrow 2Al_2O_3$

Part 4 :

The given chemical reaction is,

$Na+F_2\rightarrow 2NaF$

This reaction is an unbalanced chemical reaction because in this reaction number of sodium atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $Na$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$2Na+F_2\rightarrow 2NaF$

Hence, the balanced chemical equation will be:

$2Al+3F_2\rightarrow 2AlF_3$

Answer 2

Answer: B

Explanation: