Which of the following is a balanced chemical equation?

The correct answer is Option 4.

Explanation:

Law of conservation of mass states that mass can neither be created nor can be destroyed but it can only be transformed from one form to another form. This law also states that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

Every balanced chemical equation follows law of conservation of mass.

For the given options:

Option 1:  

Here, number of chlorine and hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 2:  

Here, number of chlorine and bromine atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 3:  

Here, number of hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 4:  

Here, number of hydrogen and oxygen atoms on both the sides are same. Thus, it is a balanced equation.

Hence, the correct answer is Option 4.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: