41. Which one is the most reactive halogen?
42. Who first published the periodic table?
43. The most suitable vessel for storing concentrated sulphuric acid is
44. Which one of the following nonmetals shows allotropy in the liquid state?
45. Sulphuric acid is
46. When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to
47. Wax used for making candle is chemically a mixture of
48. Adding Cl2 to benzene in the presence of AlCl3 is an example of :
49. Benzene cannot undergo :
50. Which one is the simplest aromatic hydrocarbon?
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