31. The name of unreactive gas is
32. The green colour seen in firework displays is due to the chloride salt of :
33. In deep-sea diving, divers use a mixture of gases consisting of oxygen and
34. Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?
35. Which of the following is not soluble in water ?
36. The most volatile of the given liquids is
37. The three elements most needed in common fertilisers are :
38. Liquid Nitrogen boils at
39. Which one of the following is not a fertilizer?
40. Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?
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