What Are the Spectator Ions and What Is the Net

question 35

Multiple Choice

What are the spectator ions and what is the net ionic equation for the following double-replacement, precipitation reaction?
Na₂S (aq) + ZnSO₄ (aq) →Spectator Ions Net reaction
I. Zn²⁺ and S^{2 -} 2 Na⁺ (aq) + SO₄^{2 -} (aq) →Na₂SO₄ (aq)
II. Na⁺ and SO₄^{2 -} Zn²⁺ (aq) + S^{2 -} (aq) →ZnS (s)
III. Na⁺ and Zn²⁺ S^{2 -} (aq) + SO₄^{2 -} (aq) → S₂O₄^{4 -} (aq)
IV. S^{2 -} and SO₄^{2 -} Na⁺ (aq) + Zn²⁺ (aq) →NaZn³⁺ (aq)
V. Na⁺ and S^{2 -} Zn²⁺ (aq) + SO₄^{2 -} (aq) →ZnSO₄ (s)

• A) I
• B) II
• C) III
• D) IV
• E) V

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Definitions:

Average Variable Cost

The average amount of variable cost per unit, calculated by dividing total variable costs by the quantity of output.

Profit-Maximizing

The approach taken by an enterprise to ascertain the optimal price and output quantity for the highest profit.

MR = MC

A principle in economics stating that profit maximization occurs when marginal revenue equals marginal cost.

Perfectly Competitive Market

An economic theory describing a market where no individual buyers or sellers have the power to influence the price of a product, and where the products offered are homogenous, with no barriers to entry or exit for businesses.