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GK QUESTION#3576

Consider the following statements:

1. Sodium bicarbonate is a white crystalline solid used in fire extinguishers.

2. Sodium bicarbonate can act as both an acid and a base.

3. Sodium chromate is commonly used to neutralise acids in household applications.

Which statements are correct?

  1. A1 and 3 only
  2. B2 and 3 only
  3. C1 and 2 onlyCorrect answer
  4. D1, 2 and 3 only
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Answer

C. 1 and 2 only

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Explanation

Statements 1 and 2 are correct. Sodium bicarbonate is a white crystalline compound used in fire extinguishers. Its hydrogen carbonate ion can accept a proton to form carbonic acid or donate a proton to form carbonate, so it can act as either an acid or a base. Statement 3 is false as a claim about common household use: sodium chromate is an industrial chromium compound used in applications such as pigments, chemical manufacture and corrosion protection, rather than a common household acid neutraliser.

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