Question

MgO + HCI → MgCI₂ + H₂O is a balanced equation. True or false?

Answer 1

False, the equation is not balanced.
For a balanced equation, the number of atoms in the both side of the equation should be equal. Therefore, the balanced equation is,

$\mathrm{MgO}+2\mathrm{HCl}\underset{}{\overset{}{\to }}{\mathrm{MgCl}}_2+{\mathrm{H}}_2\mathrm{O}$
Now, the number of atoms in the LHS and RHS of the reaction are equal.