ICSE Class 10 Chemistry 2020 Solved Paper

Identify the salts P,Q,R from the following observations :

Question : 72

Total: 86

Salt Q is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt Q produces chalky white insoluble precipitate with excess of ammonium hydroxide.

Solution:

Salt Q=Pb(NO3)2 Lead nitrate.
Pb(NO3)2 is white in colour and on heating decomposes to yellow residue PbO and a reddish brown gas nitrogen dioxide. Pb(NO3)2 reacts with excess NH4‌OHto give white ppt. of Pb(OH)2 .

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