TRB MODEL QUESTIONS FOR CHEMISTRY
| 56. |
Which of the following is used in softening of hard water? |
| |
- A. Baking soda
- B. Plaster of paris
- C. Washing soda
- D. Bleaching powder
|
| 57. |
----- gas is used to purify drinking water. |
| |
- A. Bromine
- B. Fluorine
- C. Astatine
- D. Chlorine
|
| 58. |
Non stick kitchen wares are coated with |
| |
- A. Graphite
- B. Silicon
- C. PVC
- D. Teflon
|
| 59. |
The organic compound used for silvering mirrors is |
| |
- A. Ethyl alcohol
- B. Acetaldehyde
- C. Ethane
- D. Acetal
|
| 60. |
Cotton is bleached by |
| |
- A. Carbon dioxide
- B. Hydrogen chloride
- C. Chlorine
- D. Potassium chloride
|
