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The common name for sodium carbonate is:

  1. baking soda

  2. washing soda

  3. soda ash

  4. bleaching powder

The correct answer is: soda ash

Sodium carbonate is a chemical compound with the formula Na2CO3 and is commonly known as soda ash. This compound is also used in industries to manufacture glass, soap, and other cleaning products. Option A (baking soda) and B (washing soda) are incorrect as they refer to sodium bicarbonate and sodium carbonate monohydrate, respectively. Option D (bleaching powder) is incorrect as it refers to a different chemical compound, calcium hypochlorite, commonly used as a bleaching agent. Thus, the common name for sodium carbonate is soda ash, making option C the correct answer.