In Which Reaction Does the Oxidation Number of Hydrogen Change

question 1

Multiple Choice

In which reaction does the oxidation number of hydrogen change?

• A)HCl (aq)+ NaOH (aq)→ NaCl (aq)+ H₂O (l)
• B)2Na (s)+ 2H₂O (l)→ 2NaOH (aq)+ H₂ (g)
• C)CaO (s)+ H₂O (l)→ Ca(OH)₂ (s)
• D)2HClO₄ (aq)+ CaCO₃ (s)→ Ca(ClO₄)₂ (aq)+ H₂O (l)+ CO₂ (g)
• E)SO₂ (g)+ H₂O (l)→ H₂SO₃ (aq)

---

Definitions:

Expected Inflation

The anticipated rate at which the general level of prices for goods and services will rise over a period.

High Inflation

A situation where there is a sustained, rapid increase in the general price level of goods and services in an economy over a period, eroding purchasing power.

High Unemployment

A condition where a large portion of the workforce is not employed, indicating a distressed economy.

Phillips Curve

An economic concept that depicts an inverse relationship between the rate of unemployment and the rate of inflation in an economy.