Q21 of 30 Page 188

Calculate the oxidation number of each sulphur atom in the following compounds:

(a) Na2S2O3 (b) Na2S4O6


(Oxidation no. of every atom is underlined by red.)


(a) Na2S2O3


NA2S2O3.JPG


(b) Na2S4O6


Na2S4o6.JPG


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19

Although heat is a path function, even then heat absorbed by the system under certain conditions is independent of path. What are those conditions? Explain.

 20

The solubility product of Al(OH)3 is 2.7 × 10–11. Calculate its solubility in g L–1 and also find out pH of this solution. (Atomic mass of Al is 27 u).

 22

Calculate the oxidation number of each sulphur atom in the following compounds:

(a) Na2S2O3 (b) Na2S4O6


(ii) Will the reactivity of both the isotopes of hydrogen be the same towards oxygen? Justify your answer.


 23

(i) Beryllium sulphate and magnesium sulphate are readily soluble in water whereas the sulphates of barium, calcium and strontium are only sparingly soluble. Explain.

(ii) Why is the temperature maintained around 393 K during the preparation of plaster of paris?