31. The oil used in the froth floatation process is
32. The number of waves in n x 10th Bohr's orbit are
33. The mass of one Avogadro number of helium atom is
34. The items amenable to detection by soft x-rays are
35. The material which can be deformed permanently by heat and pressure is called a
36. The mass number of a nucleus is
37. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
38. The gas used in the manufacture of vanaspati from vegetable oil is
39. The ionic radii of N3-, O2-, F- and Na+ follows the order
40. The graphite rods in the nuclear reactor
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