61. Which one of the following is the purest form of Carbon?
62. The group . . . . . . . . contains inert gases.
63. Diamond is a
64. Buckminster fullerene is an allotrope of
65. What kind of a resource is water?
66. Soda-acid is the salt used in fire extinguishers is-
67. Consider the following statements
1. The non-metals are either solids or gases except brominewhich is a liquid.
2. Iodine is a non-metal but it is lustrous.
3. Diamond, an allotrope of carbon, is the hardest natural substance.
Which of the statements given above are correct?
1. The non-metals are either solids or gases except brominewhich is a liquid.
2. Iodine is a non-metal but it is lustrous.
3. Diamond, an allotrope of carbon, is the hardest natural substance.
Which of the statements given above are correct?
68. Which of the following gases is used to prevent foods or chips from being oxidized?
69. The electronic configurations of the four elements are given below. Which of the following would be more electro negative?
70. Inert gases are
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