PG TRB Chemistry Study Materials Pdf Free Download
| 1. |
Hardness of water is due to the soluble salts of |
| |
- A. Calcium and magnesium
- B. Sodium and magnesium
- C. Potassium and calcium
- D. Sodium and potassium
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| 2. |
The element with the maximum number of isotopes in nature is |
| |
- A. Lead
- B. Hydrogen
- C. Uranium
- D. Carbon
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| 3. |
The poisonous gas produced by a Motor car? |
| |
- A. Nitrous oxide
- B. Carbon disulphide
- C. Methyl isocyanate
- D. Carbon monoxide
|
| 4. |
Polymer of amino acid is |
| |
- A. Protein
- B. Fat
- C. Sugar
- D. Phenol
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