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JEE Advanced levelSingle correct optionDifficulty 3 of 3sb073

A light silvery metal M floats on water. It burns in air to give a white mixture of its oxide and a nitride Q. Q reacts with water to give an alkaline gas. The nitrate of M on strong heating gives a brown gas and a gas that rekindles a glowing splint. The solid residue obtained on heating the nitrate of M is

  1. A
  2. B
  3. C
  4. D

Answer: C

A metal that floats on water and forms a nitride on burning is Li (Mg and Ca are denser than water). gives the alkaline gas. Unlike the other alkali nitrates, LiNO3 decomposes as , so the residue is .
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