Question

Which of the following equations is balanced

Answer 1

Answer:- Third equation, $2Al(s)+3FeO(s)\rightarrow Al_2O_3(s)+3Fe(s)$ is balanced.

Explanations:- A balanced equation has equal number of atoms of each element on both sides.

In first equation, both sides have two Al, so Al is balanced. Both sides have three O and so O is also balanced. Left side has three Fe but the right side has only one Fe and so the reaction is not balanced as it has unequal Fe on both sides.

In second equation, Al is balanced as both sides have two Al. Fe and O are not balanced as left side has one Fe and one O where as the right side has three Fe and three O. So, the reaction is not balanced.

In third equation, both sides have two Al, three Fe and three O and it makes the reaction balanced. So, the third equation is balanced.

In fourth equation, both sides have three Fe and three O and so they are balanced but Al is not balanced as the left side has one Al where as the right side has two Al. So, this equation is not balanced.

Hence, the only correct choice is third equation, $2Al(s)+3FeO(s)\rightarrow Al_2O_3(s)+3Fe(s)$