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Chapter-2 - 11th - Experimental Techniques in Chemistry Preparation Multiple Questions and Answers.
| 31. | Which of the following technique is simple and efficient to purify a substance | ||
| A. | Filtration | ||
| B. | Sublimation | ||
| C. | Crystallization | ||
| D. | Solvent extraction | ||
| 32. | In solvent, extraction ether is used to separate products of organic synthesis from | ||
| A. | Water | ||
| B. | Iodine | ||
| C. | Hydrochloric acid | ||
| D. | Gases | ||
| 33. | 95% ethanol is called | ||
| A. | Methylated spirit | ||
| B. | Wood spirit | ||
| C. | Rectified spirit | ||
| D. | Absolute alcohol | ||
| 34. | The use of CaCl2 and PCl5 in the process of crystallization is as a | ||
| A. | Oxidizing agent | ||
| B. | Reducing agent | ||
| C. | Drying agent | ||
| D. | Coloring agent | ||
| 35. | The ratio of the amount of solute in an organic and aqueous solvent is | ||
| A. | Retardation factor | ||
| B. | Distribution coefficient | ||
| C. | Distribution in aqueous solution | ||
| D. | All statements are wrong | ||
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