Which of the following equations is a balanced one?

Which of the following equation is a balanced equation ?

Which of the following equation is a balanced equation ?

Which of the following equation is not balanced?

Which of the following equations are balanced? Mg+O_2 -------- MgO

Which of the following is not a balanced equation

Which of the following equation is correctly balanced ?

Which of the following equations is (are) not correctly balanced ?

State the type of reactions each of the following equations represent and balance the ones that are not balanced. Fe + CuSO_4 to FeSO_4 + Cu

State the type of reactions each of the following equations represent and balance the ones that are not balanced. CaCO_3 to CaO + CO_2

State the type of reactions each of the following equations represent and balance the ones that are not balanced. NaOH + HCl to NaCl + H_2 O