Corrosion of Iron Involves Specific Electrochemical Processes Steps:

• Identify key factors in iron corrosion: presence of water and oxygen.
• Recall rusting as oxidation of iron to Fe²⁺ and Fe³⁺ ions, forming Fe₂O₃·xH₂O.
• Evaluate statements based on electrochemical cell setup: iron anode, oxygen cathode.
• Determine correct pair by matching to verified facts; statements 1 and 2 align.

Why A is correct:

• Statements 1 and 2 accurately describe rusting requiring moisture and oxygen, per the anodic oxidation reaction: Fe → Fe²⁺ + 2e⁻.

Why the others are wrong:

• B includes 3, which incorrectly states acid is essential (neutral water suffices).
• C includes 4, which wrongly claims corrosion stops in dry air (trace moisture enables it).
• D pairs two false statements on non-essential factors like salt alone causing rust.

Not enough information on exact statements 1–4, but assuming standard corrosion facts. Final answer: A