41. The first organic compound synthesised in the laboratory was
42. Among the following, carbonate ore of Zinc is
43. The metal used for making aircrafts and rockets is
44. The compound that has the least value for octane number is :
45. The length of double bond is _______ than single bond.
46. An example of heterocyclic compound is
47. In organic compounds, nitrogen is estimated by
48. Heavy metals got their name because compared to other atoms they have
49. Which one of the following elements exhibits the greatest tendency to lose electrons ?
50. Which one is heaviest naturally occurring element of the periodic element?
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