Entry Test MCQ :: Experimental Techniques
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| 21. |
Which of the following technique is simple and efficient to purify a substance |
| A. |
Filtration |
B. |
Sublimation |
| C. |
Crystallization |
D. |
Solvent extraction |
Answer: Option D
Explanation:
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| 22. |
In solvent extraction ether is used to separate products of organic synthesis from |
| A. |
water |
B. |
iodine |
| C. |
hydrochloric acid |
D. |
gases |
Answer: Option A
Explanation:
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| 23. |
95% ethanol is called |
| A. |
methylated spirit |
B. |
wood spirit |
| C. |
rectified spirit |
D. |
absolute alcohol |
Answer: Option C
Explanation:
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| 24. |
The use of CaCl2 and PCl5 in the process of crystallization is as a |
| A. |
oxidizing agent |
B. |
reducing agent |
| C. |
drying agent |
D. |
colouring agent |
Answer: Option C
Explanation:
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| 25. |
Ratio of the amount of solute in organic and aqueous solvent is |
| A. |
Retardation factor |
B. |
Distribution co-efficient |
| C. |
Distribution in aqueous solution |
D. |
All statements are wrong |
Answer: Option B
Explanation:
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| 26. |
Without suction pump filtration is |
| A. |
Fast process |
B. |
Slow process |
| C. |
Rapid process |
D. |
All are possible |
Answer: Option B
Explanation:
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| 27. |
Animal charcoal adsorbs the coloured |
| A. |
impurities |
B. |
crystals |
| C. |
solvents |
D. |
both a & b |
Answer: Option A
Explanation:
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| 28. |
Direct conversion of solids into vapours is called |
| A. |
Solvent extraction |
B. |
sublimation |
| C. |
crystallization |
D. |
vaporization |
Answer: Option B
Explanation:
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| 29. |
Crystallization does not involve |
| A. |
heating |
B. |
sublimation |
| C. |
cooling |
D. |
vaporization |
Answer: Option B
Explanation:
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| 30. |
In CCI4 I2 shows |
| A. |
Red colour |
B. |
Purple colour |
| C. |
Blue colour |
D. |
Yellow colour |
Answer: Option B
Explanation:
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