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Standard IX
Chemistry
Arrehenius Theory of Acids and Bases
Question

Which one of the following statements is true?
  1. All alkalis are bases
  2. Rusting is a combination of iron with oxygen dissolved in water
  3. Heavy water accelerates the growth of living organisms, plants and animals
  4. Sodium carbonate is used as a baking powder

A
Rusting is a combination of iron with oxygen dissolved in water
B
Heavy water accelerates the growth of living organisms, plants and animals
C
All alkalis are bases
D
Sodium carbonate is used as a baking powder
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Solution
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All alkalis are bases.
Rusting is a slow action of air and moisture which degrades the metal.
Heavy water inhibits the growth of living organisms.
Sodium carbonate is washing powder.
So, option A is correct.

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