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ICSE Class 10 Chemistry 2015 Paper

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From the list of the following salts choose the salt that most appropriately fits the description given in the following :
{[AgCl,MgCl2,NaHSO4,PbCO3,ZnCO3.}\left\{ [ \mathrm{AgCl}, \mathrm{MgCl}_2, \mathrm{NaHSO}_4, \mathrm{PbCO}_3, \mathrm{ZnCO}_3. \right\} KNO3,Ca(NO3)2]\mathrm{KNO}_3, \mathrm{Ca}(\mathrm{NO}_3)_2]
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Question : 85 of 85
Marks: +1, -0
On heating this salt, a brown coloured gas is evolved.
Solution:  
Ca(NO3)2\mathrm{Ca}(\mathrm{NO}_3)_2.
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