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Question
In the laboratory preparation method of ammonia, heating of ammonium chloride with slaked lime results in the formation of ammonia and water vapour along with calcium chloride.
In this method,
Statement I: Ammonia gas is collected by the downward displacement of air.
Statement II: Concentrated sulphuric acid is used as a drying agent.
Statement III: Ammonia gas collected in the cylindrical column changes the colour of moist red litmus paper blue.
Which of the above statements is/are correct?
In the laboratory preparation method of ammonia, heating of ammonium chloride with slaked lime results in the formation of ammonia and water vapour along with calcium chloride.
In this method,
Statement I: Ammonia gas is collected by the downward displacement of air.
Statement II: Concentrated sulphuric acid is used as a drying agent.
Statement III: Ammonia gas collected in the cylindrical column changes the colour of moist red litmus paper blue.
Which of the above statements is/are correct?
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Solution
The correct option is C I and III
The laboratory setup comprises of ammonium chloride which is heated with slaked lime in a test tube:
2NH4Cl(s)+Ca(OH)2(s)→CaCl2(s)+2H2O(g)+2NH3(g)
As the reactants are heated, ammonia along with water vapours and calcium chloride is formed.
This mixture is then passed through quicklime which acts as a drying agent and absorbs the water vapours formed in the above reaction.
Being lighter than air, ammonia gas is then collected in an inverted cylindrical column by downward displacement of air.
Also, ammonia gas is basic in nature which can turn a moist red litmus paper blue.
The laboratory setup comprises of ammonium chloride which is heated with slaked lime in a test tube:
2NH4Cl(s)+Ca(OH)2(s)→CaCl2(s)+2H2O(g)+2NH3(g)
As the reactants are heated, ammonia along with water vapours and calcium chloride is formed.
This mixture is then passed through quicklime which acts as a drying agent and absorbs the water vapours formed in the above reaction.
Being lighter than air, ammonia gas is then collected in an inverted cylindrical column by downward displacement of air.
Also, ammonia gas is basic in nature which can turn a moist red litmus paper blue.
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