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JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Hydrogen

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The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are :
  1. (A) and
  2. (B) and
  3. (C) and ✓ Correct
  4. (D) and

Answer: (C)

Solution

Temporary hardness comes from dissolved bicarbonate. For magnesium, boiling expels and throws down the hydroxide rather than the carbonate: . So is and is .

JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Single correct option

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