51. Which one of the following is not a compound?
52. Lead pencil has percentage of lead . . . . . . . .
53. Which of the following is not a combined form of carbon?
54. Which of the following elements has the unique ability to combine with other atoms of the same element to produce larger molecules?
55. Marsh gas primarily contains
56. Consider the following statements
1. Ozone is used as germicide, air and water purifiers, in making artificial, silk etc.
2. Bitterness in the onions is due to presence of sulphur compounds.
3. Heliumis used in filling the tyres of the aircraft.
Which of the statements given above are correct?
1. Ozone is used as germicide, air and water purifiers, in making artificial, silk etc.
2. Bitterness in the onions is due to presence of sulphur compounds.
3. Heliumis used in filling the tyres of the aircraft.
Which of the statements given above are correct?
57. In a diamond, each carbon atom is bonded to . . . . . . . .
58. Which of the following statement(s) is/are correct?
59. Choose which is different or odd in the following.
60. Due to the presence of . . . . . . . . we get that smell, which tells us that the LPG cylinder is leaking?
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