Answer:
      Option-A, 142 g is the correct answer.
Solution:
Balance Chemical Equation is as follow,
              2 NaOH + H₂SO₄   →  Na₂SO₄  + 2 H₂O
According to equation,
    79.98 g (2 mole) NaOH react to form = 142 g (1 mole) of Na₂SO₄
So,
     80 g NaOH on reaction will produce = X g of Na₂SO₄
Solving for X,
                X = (142 g × 80 g) ÷ 79.99 g
                X = 142.01 g of Na₂SO₄
