E-PolyLearning

31. Formula of Hydrogen Carbonate ion is
a. HCO₂
b. HCO₃
c. HCO₄
d. H₂CO₃
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Answer: (b).HCO₃

32. In Na₂CO₃.10H₂O, percentage of oxygen is
a. 0.1678
b. 0.1608
c. 0.1659
d. 0.1684
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Answer: (a).0.1678

33. Formula of aluminum sulphate indicates that
a. for each ion of Al, two ions of sulphate are required
b. for each ion of Al, three ions of sulphate are required
c. for two ions of Al, 3 ions of sulphate are required
d. for two ions of Al, three ions of sulphate are required
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Answer: (c).for two ions of Al, 3 ions of sulphate are required

34. All of these ions have a valency of +2 except
a. Pb
b. Ca
c. Zn
d. NH₄
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Answer: (d).NH₄

35. A water molecule will always contain
a. 11% of oxygen and 89% of hydrogen
b. 18% of oxygen and 88% of hydrogen
c. 11.11% of oxygen and 88.89% of hydrogen
d. 15% of oxygen
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Answer: (c).11.11% of oxygen and 88.89% of hydrogen