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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
What effect does salt have on the corrosion of iron?
  • A
    Absolutely none
  • ✓
    Speeds up the reaction
  • C
    Stops rust in it's tracks
  • D
    Gives off a different type of rust
✓

Answer

Correct option: B.
Speeds up the reaction
Salt in water speeds up the reaction. This is because lots of dissociated ions are present in salt. As salt is a strong electrolyte and hence this tremendously accelerates corrosion in saltwater.

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