Sulphur And Its Compounds - 4


1. The percentage occurrence of sulphur in the earth crust is ________.




2. The chemical formula of galena is ________.




3. Gypsum is an ore of ________.




4. The shape of monoclinc sulphur is ________.




5. ________ is an unstable allotrope of sulphur.




6. Under ground deposits of sulphur are found 200 meters below the surface of the earth and contain about ________ of free sulphur.




7. The Valency of sulphur in sodium sulphide (Na2S) is ________.




8. In contact process, the oxidation of SO2 to SO3 takes place at ________.




9. Sulphuric acid can dehydrate glucose into ________.




10. 2H2SO4(conc) + Zn(s) heat------>




11. __________ acid is used as a dehydrating agent and an electrolyte in lead accumulators.


12. H2SO4 acts as a strong oxidizing agent and during the reaction acid itself is reduced to ________.


13. _________ can absorb water from sugar leaving behind carbon.


14. SO2 is oxidized to SO3 during contact process in the presence of a catalyst ________.





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