TRB MODEL QUESTIONS FOR CHEMISTRY
| 66. |
The fertilizer essential for the growth tobacco is |
| |
- A. Urea
- B. Super phosphate of lime
- C. Potassium nitrate
- D. Ammonium sulphate
|
| 67. |
Who prepared the first periodic table? |
| |
- A. Moseley
- B. Lother Mayer
- C. Mendeleev
- D. Dobereiner
|
| 68. |
The chief constituent of vinegar is |
| |
- A. Oxalic acid
- B. Formic acid
- C. Salicylic acid
- D. Acetic acid
|
| 69. |
The elements present in zero group are called |
| |
- A. Alkali metals
- B. Transition
- C. Inert gases
- D. Alkali earth metals
|
| 70. |
Which one of the following is a radioactive element? |
| |
- A. Zinc
- B. Plutonium
- C. Oxygen
- D. Caesium
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