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