2014

61. Which of the following metals remain in liquid for under normal conditions? A.     Radium    B.     Zinc C.

56. Water is a good solvent of ionic salts because A.     it has a high specific heat B.   

51. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the

46. In fireworks, the green flame is produced because of A.     sodium    B.     barium C.     mercury    D.

41. What is laughing gas? A.     Nitrous Oxide B.     Carbon monoxide C.     Sulphur dioxide D.     Hydrogen

36. Which of the following was to be discovered first in the chromospheres of the sun? A.     Krypton    B.

31. Potassium nitrate is used in A.     medicine    B.     fertiliser C.     salt    D.     glass Answer &

26. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the

21. When an iron nail gets rusted, iron oxide is formed A.     without any change in the weight of

21. When an iron nail gets rusted, iron oxide is formed A.     without any change in the weight of

16. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

1. Brass gets discoloured in air because of the presence of which of the following gases in air? A.