E-PolyLearning

6. Valency of carbonate ion CO₃? is
a. -1
b. -2
c. -3
d. -4
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Answer: (a).-1

7. All are covalent compounds except
a. NO₂
b. SO₃
c. SO₂
d. HNO₃
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Answer: (d).HNO₃

8. Empirical formula is the
a. simplest formula
b. molecular formula
c. chemical formula
d. ionic exponential formula
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Answer: (a).simplest formula

9. All of these radicals have a valency of 2, except
a. SO₄
b. CO₃
c. NH₄
d. MgCO₃
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Answer: (c).NH₄

10. Formula of hydrated Sodium Carbonate is
a. Na(HCO₃)₂
b. Na₂CO₃.(H₂O)₅
c. Na₂CO₃.10H₂O
d. Na3CO₄.10H₂O
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Answer: (c).Na₂CO₃.10H₂O

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