Which of the fo llowing eq uations is not b alanced? NaCl+H_(2)SO_(4)-Na_(2)SO_(4)+HCl 2Mg+O_(2)-gt 2MgOlt Fe+S-FeS KOH+HClarrow KCl+H_(2)O

## Step1To determine which of the given chemical equations is not balanced, we need to verify if the number of atoms of each element is the same on both sides of the equation.## Step2The first equation is . This equation is unbalanced. Sodium (Na) appears twice on the right but only once on the left. Chlorine (Cl) and hydrogen (H) are balanced, but sulfur (S) and oxygen (O) are not balanced. ## Step3The second equation is . This equation is balanced. There are two magnesium (Mg) atoms and two oxygen (O) atoms on each side of the equation.## Step4The third equation is . This equation is balanced. There is one atom of iron (Fe) and one atom of sulfur (S) on both sides of the equation.## Step5The fourth equation is . This equation is balanced. There is one atom each of potassium (K), hydrogen (H), chlorine (Cl), and oxygen (O) on both sides of the equation.