A micelle formed during the cleansing action by soap is
a discrete particle of soap
aggregated particles of soap and dirt
a discrete particle of dust
an aggregated particle of dust and water
B.
aggregated particles of soap and dirt
Soap contains hydrophobic (ie, fat soluble or water repelling) as well as hydrophilic (water soluble) end Hydrophobic end remains soluble in dust or grease particles while hydrophilic end is attracted towards water. Hence, several hydrophobic pocket surrounds the grease particles. This aggregate of soap and dirt is called micelle. On washing with plenty of water dust is removed along with soap.
Initial setting of cement is mainly due to :
hydration and gel formation
dehydration and gel formation
hydration and hydrolysis
dehydration and dehydrolysis
Consider the following compounds :
1. Sulphur dioxide
2. Hydrogen peroxide
3. Ozone
Among these compounds identify those that can act as bleaching agent :
1 and 3
2 and 3
1 and 2
1, 2 and 3
Barbituric acid and its derivatives are well known as:
tranquilizers
antiseptics
analgesics
antipyretics
The reagent used in the preparation of aspirin from salicylic acid is
SOCl2/ pyridine
CH3COOH / HCl
(CH2CO)2O/ Conc. H2SO4
CH3Cl/ AlCl3
Match the following:
| List - I | List - II |
| A. Oxyhaemoglobin | i. Analgesic |
| B. Aspirin | ii. Oxygen carrier |
| C. Haemoglobin | iii. Photosynthesis |
| D. Chlorophyll |
iv. Oil of winter green v. Fe2+ paramagentic |
The correct match is
A - v; B - i; C - ii; D - iii
A - iv; B - ii; C - i; D - iii
A - iii; B - i; C - ii; D - iv
A - v; B - ii; C - iii; D - i
Parkinson's disease is linked to abnormaties in the levels of dopamine in the body. The structure of dopamine is
