E-PolyLearning

31. Weak acids include
a. H₂CO₃
b. H₂SO₃
c. H₂SO₄
d. both a and b
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Answer: (d).both a and b

32. Acid become colorless when added with
a. screened methyl orange indicators
b. phenolphthalein indicator
c. litmus indicator
d. universal indicator
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Answer: (b).phenolphthalein indicator

33. Acids reacts with metal carbonates to form
a. salt
b. water
c. carbon dioxide
d. all of these
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Answer: (d).all of these

34. Onion juice is
a. acidic
b. alkaline
c. neutral
d. basic
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Answer: (a).acidic

35. Universal indicator can be used to
a. test acids and alkalis
b. to test strong acids and weak acids
c. to test concentration of a particular solution
d. both a and b
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Answer: (d).both a and b