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Standard XII

Chemistry

Preparations and Uses of Caustic Soda

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Question

You are given a colourless solution and was told to add a little $N a C l$ solution to it. A cloudy white precipitate was made. What conclusion should you draw about the nature of the colourless solution? The ppt dissolves in hot water, then the ppt is :

A g C l

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P b C l_{2}

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A g_{2} S O_{4}

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P b S O_{4}

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Solution

The correct option is B $P b C l_{2}$
It is given that a colourless solution gives cloudy white precipitate on adding a little $N a C l$ solution. Now, white ppt can be of $A g C l$ or $P b C l_{2}$ .
To make further distinction, warm the solution.
$P b C l_{2}$ dissolves in hot water while $A g C l$ remains insoluble. $A g C l$ dissolves in $a q$ $N H_{3}$ .
Since the ppt dissolves in hot water, it is $P b C l_{2}$ .

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You are given a colourless solution and was told to add a little NaCl solution to it. A cloudy white precipitate was made. What conclusion should you draw about the nature of the colourless solution? The ppt dissolves in hot water, then the ppt is :

You are given a colourless solution and was told to add a little $N a C l$ solution to it. A cloudy white precipitate was made. What conclusion should you draw about the nature of the colourless solution? The ppt dissolves in hot water, then the ppt is :