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)

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Definitions:

Depreciable Base

The cost of an asset less its salvage value, representing the total amount that can be depreciated over its useful life.

Residual Value

Residual value is the estimated value of an asset at the end of its useful life, reflecting what it could be sold for or its salvage value.

Fixed-Percentage Method

The Fixed-Percentage Method is a depreciation technique where a constant percentage of the asset's book value is depreciated each year, resulting in decreasing annual depreciation expenses.

Residual Value

The estimated amount that an asset is expected to realize upon its disposal at the end of its useful life.