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41. The water solution of S02 is (NTSE Uttar Pradesh, Stage-I, 2015-16)
Sulphurous acid
Sulphuric acid
Pyrosulphuric acid
None of these
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42. Match the items of Column-I with the items of Column-II Column-I Column-II a. aq. NaCI solution (i) Acidic b. aq. Na2C03 solution (ii) Basic c. aq. NH4CI solution (iii) Neutral d. aq. CaO solution (iv) Amphoteric (NTSE Delhi, Stage-I, 2015-16)
c(i), d(iii), b(ii), a(i)
d(i), b(iv), a(iii), c(iv)
a(iii), b(ii), c(i), d(iii)
b(ii), a(iii), d(ii), c(i)
43. The pH of pure water at 25°C is 7. If water is heated to boil, then (NTSE Delhi, Stage-I, 2015-16)
pH will decrease and water will become acidic
pH will increase and water will become basic
pH will decrease but water will remain neutral
pH will remain 7
44. The correct order of acidic strength of the following oxides is (NTSE Delhi, Stage-I, 2015-16)
CaO < Na20 < CO2 < ZnO
Na20 < CaO < ZnO < CO2
ZnO < CO2 < CaO < Na2O
CO2 < ZnO < Na20 < CaO
45. The molecular formula of bleaching powder is _ (NTSE Telangana, Stage-I, 2015-16)
CaOCI2
Ca(OH)2
CaCI2
NaCI
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