Some Basic Concepts of Chemistry - Result Question 28

####28. The difference in the oxidation numbers of the two types of sulphur atoms in Na2S4O6 is

(2011)

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Solution:

  1. Unlike other metal carbonates that usually decomposes into metal oxides liberating carbon dioxide, silver carbonate on heating decomposes into elemental silver liberating mixture of carbon dioxide and oxygen gas as :

Ag2CO3(s) Heat 2Ag(s)+CO2(g)+12O2(g) MW=276g2×108=216g

Hence, 2.76g of Ag2CO3 on heating will give

216276×2.76=2.16gAg as residue. 



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