E-PolyLearning

21. Formula of carbonic acid is
a. HCO₂
b. HCHO₃
c. H₂CO₂
d. H₂CO₃
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Answer: (d).H₂CO₃

22. To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of Al(OH)₃ molecules will be
a. 1
b. 2
c. 3
d. 4
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Answer: (b).2

23. In Na₂CO₃.10H₂O, percentage of water is
a. 0.5009
b. 0.1699
c. 0.6507
d. 0.6294
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Answer: (d).0.6294

24. All of these radicals have a valency of 1, except
a. OH
b. CO₃
c. NO₃
d. HCO₃
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Answer: (b).CO₃

25. A white smoke consisting of fine white solid particles is formed by
a. propane
b. butane
c. magnesium oxide
d. tin oxide
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Answer: (c).magnesium oxide

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