E-PolyLearning

36. Greatest proportion by mass of nitrogen is in
a. Hydrazine (N₂H₄),
b. ammonium nitrate (NH₄NO₃)
c. ammonium sulphate (NH₄)₂SO₄
d. urea (NH₂CONH₂)
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Answer: (a).Hydrazine (N₂H₄),

37. Chemical formula of monohydrate monosodium phosphate is
a. H₂ONaPO₂
b. PO₂NaH₂O
c. NaH₂PO₄.H₂O
d. NaH₃PO₂.H₂O
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Answer: (c).NaH₂PO₄.H₂O

38. Chemical formula of aluminum oxide is
a. Al₂O₃
b. AlO₄
c. Al₂O₅.H₂O
d. Al₂O₅
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Answer: (a).Al₂O₃

39. Molar mass of potassium hydrogen carbonate KHCO₃ is
a. 90.15g/mol
b. 100.115g/mol
c. 111.127g/mol
d. 119.21g/mol
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Answer: (b).100.115g/mol

40. In Na₂CO₃, relative atomic mass of Carbon is
a. 12
b. 24
c. 36
d. 48
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Answer: (a).12