Answer:
Option A. 1, 1, 1, 2
Step-by-step explanation:
_Na₂SO₄ + _BaCl₂ —> _BaSO₄ + _NaCl
To know which option is correct, we shall balance the equation. The equation given in the question above can be balanced as follow:
Na₂SO₄ + BaCl₂ —> BaSO₄ + NaCl
There are 2 atoms of Cl on the left side and 1 on the right side. It can be balance by writing 2 before NaCl as illustrated below:
Na₂SO₄ + BaCl₂ —> BaSO₄ + 2NaCl
Now, the equation is balanced.
The coefficients are: 1, 1, 1, 2
Thus, option A gives the correct answer to the question.