TRB MODEL QUESTIONS FOR CHEMISTRY
61. |
Vulcanising is the process of heating rubber with |
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- A. Peroxide compound
- B. Sulphur
- C. Phosphorus
- D. Nitrogen
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62. |
Biogas mainly contains |
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- A. Methane
- B. Oxygen
- C. Nitrogen
- D. Carbon dioxide
|
63. |
Iodine with starch gives the colour which? |
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- A. Pink
- B. Blue
- C. Red
- D. White
|
64. |
------ is not a chief ore of phosphorous. |
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- A. Bone ash
- B. Acetaldehyde
- C. Phosphorite
- D. Felspar
|
65. |
Which of the following is a poor conductor of electricity? |
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- A. Metalloids
- B. Ionic compounds
- C. Covalent compounds
- D. Co–ordination compounds
|