41. In . . . . . . . . each carbon atom is bound to three other carbon atoms in the same plane providing hexagonal array.
42. Which allotropes of carbon form geodesic globes?
43. In . . . . . . . . each carbon atom is bound to four other carbon atoms that form a strongly threedimensional structure.
44. Which of the following is not a noble gas?
45. Allotropes of an element have different physical characteristics because they/their.
46. Which of the non-metals is brighter?
47. Incomplete combustion of a fuel gives poisonous . . . . . . . . gas.
48. Silver gets corroded due to . . . . . . . . in air.
49. What is the bond order of CO group?
50. 2O represents two . . . . . . . . of oxygen.
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