Chemistry: Oxidation and Reduction

Oxidation involves:

Losing Electron; Gaining Hydrogen

Gaining Electron; Losing Hydrogen

Losing Electron; Losing Hydrogen

Gaining Electron; Gaining Hydrogen

Reduction involves:

Losing Electron; Gaining Oxygen

Losing Electron; Losing Oxygen

Gaining Electron; Gaining Oxygen

Gaining Electron; Losing Oxygen

In reaction Zn +H₂O→ ZnO + H₂, which element, if any, is oxidised?

Zinc

Hydrogen

Oxygen

In reaction NaOH + Li → LiOH + Na, Li act as:

Oxidising Agent

Reducing Agent

Another name for "oxidation-reduction" reaction is called:

Neutralisation Reaction

Chemical Reaction

Redox Reaction

Disproportionation Reaction

In reaction Cu₂⁺ + 2NO₃^- + 4H⁺ → Cu₂⁺ + 2NO₂ + 2H₂O

What is the reducing agent?

NO3-

H+

H2O

Which of the following undergoes reduction?

I. 2Cl^- → Cl₂

II. Cl₂ → 2Cl^-

III. Zn → Zn²⁺

IV. Zn²⁺ → Zn

I and II

II and III

I and III

II and IV

Define Reducing Agent.

A species that causes others to be reduced whilst itself is oxidised.

A species that causes others to be oxidised whilst itself is also oxidised.

A species that causes others to be oxidised whilst itself is reduced.

A species that causes others to be reduced whilst itself is also reduced.

CrO₄²⁻(aq)→Cr(OH)₄⁻(aq)

Chromium undergoes which of the following processes?

Oxidation

Reduction

Redox reaction

None of these above

What represents the total oxidation state for an ionic compound?

It equals the charge of the cation

It equals the charge of the anion.

It is equivalent to the magnitude of the ion with the higher charge.

It equals zero.

What is the oxidation number of chromium in CaCrO₄?

Chemistry: Oxidation and Reduction

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