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A student took a white salt in a test tube and started heating.He heard a crackling noise after few minutes.and then brown fumes were released. Identify the salt. Name the brown gas.Give a balanced chemical equation for the reaction.What type of reaction is this?

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A student took a white salt in a test tube and started heating.He heard a crackling noise after few minutes.and then brown fumes were released. Identify the salt. Name the brown gas.Give a balanced chemical equation for the reaction.What type of reaction is this?

by Chief of LearnyVerse
(321k points)
in Chemistry-10
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A  student took a white salt in a test tube and started heating.

He heard a crackling noise after few minutes.and then brown fumes were released.
 
  1. Identify  the salt. 
  2. Name the brown gas.
  3. Give a balanced chemical equation for the reaction.
  4. What type of reaction is this?
     

1 Answer

by Chief of LearnyVerse
(321k points)
 
0 votes

Reddish brown gas is liberated from the white solid indicating that its nitrogen dioxide. 

The yellow solid residue is lead oxide. So the white solid is lead nitrate 

  1. White solid is lead nitrate - Pb(NO3)2
  2. The gas liberated is reddish brown which is nitrogen dioxide and the other gas is oxygen
  3. The balanced equation for this reaction is  - 2Pb(NO3)2 → 2 PbO + 4 NO2 + O23. 
  4. This was thermal decomposition reaction as heat was involved in it.

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