Which of These Is/are Oxidation-Reduction Reaction(s)

question 29

Multiple Choice

Which of these is/are oxidation-reduction reaction(s) ?
I. PCl₃ + 3H₂O → 3HCl + H₃PO₃
II. Fe₂O₃ + 3CO → 2Fe + 3CO₂
III. CaCO₃ + HClO₃ → Ca(ClO₃) ₂ + CO₂ + H₂O

• A) I only
• B) II only
• C) I and II
• D) I and III
• E) I, II, and III

---

Definitions:

Fixed Manufacturing Overhead Volume Variance

The difference between the budgeted and actually applied fixed manufacturing overhead, based on standard costs for a given period.

Fixed Overhead Budget Variance

The difference between actual fixed overhead costs and the budgeted or expected fixed overhead costs.

Volume Variance

A measure of the difference between the budgeted and actual volume of production, impacting costs.

Overhead Variances

The difference between actual overhead costs and the budgeted or standard overhead costs.