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JEE Advanced levelSingle correct optionDifficulty 3 of 3sb026

A grey-white solid X is formed when a metal that gives a brick-red flame is heated in hydrogen at about . X reacts violently with water to give a gas Y and a clear solution Z, and Z turns milky when is passed. Which option gives X and the amount of Y from mol of X?

  1. A; mol of
  2. B; mol of
  3. C; mol of
  4. D; mol of

Answer: A

The brick-red flame identifies calcium, so X is , and Z is limewater, which turns milky with . , so each mole of X gives 2 mol of and mol gives mol.
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