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ICSE Class 10 Chemistry 2020 Paper

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Identify the salts P,Q,RP, Q, R from the following observations :
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Question : 72 of 86
Marks: +1, -0
Salt QQ is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt QQ produces chalky white insoluble precipitate with excess of ammonium hydroxide.
Solution:  
Salt Q=Pb(NO3)2Q=\mathrm{Pb}(\mathrm{NO}_3)_2 Lead nitrate.
Pb(NO3)2\mathrm{Pb}(\mathrm{NO}_3)_2 is white in colour and on heating decomposes to yellow residue PbO\mathrm{PbO} and a reddish brown gas nitrogen dioxide. Pb(NO3)2\mathrm{Pb}(\mathrm{NO}_3)_2 reacts with excess NH4OH\mathrm{NH}_4\mathrm{OH}to give white ppt. of Pb(OH)2\mathrm{Pb}(\mathrm{OH})_2 .
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