Last seen: Mar 10, 2022
If the ore or the gangue can be attracted by the magnetic field, then the ore can be concentrated by the process of magnetic separation. The ores of i...
Correct answer: (3) 4(S – R) Explanation: figure.png V → Vertex F → Focus VF = S - R So latus rectum = 4(S – R)
Correct answer: (4) a = , b ≠ Explanation: Here D = = 2(-a - 1) -1 (a - 1) + 1 + 1 = 1 - 3a D3 = = 2(-b - 3) - 1(b - 3) + 5(1 + 1) = ...
Correct answer: (4) x2 – 2x – 4 = 0 Explanation: cosec 18° = = = Let cosec 18° = x = ⇒ x - 1 = √5 Squaring both sides, we get x2 - 2...
Correct answer: (1) 4p2 + q2 Explanation: First line is - = ⇒ xcosα - ysinα = cos2α ⇒ p = ⇒ 2p = |kcos2α| .....(i) second line is xsi...
Common salt (a typical crystalloid in an aqueous medium) behaves as a colloid in a benzene medium. Hence, we can say that a colloidal substance does n...
(i) Alcosol: A colloidal solution having alcohol as the dispersion medium and a solid substance as the dispersed phase is called an alcosol. For ex...
Four uses of emulsions: (i) Cleansing action of soaps is based on the formation of emulsions. (ii) Digestion of fats in intestines takes place b...
Four uses of emulsions: (i) Cleansing action of soaps is based on the formation of emulsions. (ii) Digestion of fats in intestines takes place b...
(i) Electrophoresis: The movement of colloidal particles under the influence of an applied electric field is known as electrophoresis. Positively char...
A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-s...
Zeolites are alumino-silicates that are micro-porous in nature. Zeolites have a honeycomb-like structure, which makes them shape-selective catalysts. ...
(a) Activity of a catalyst: The activity of a catalyst is its ability to increase the rate of a particular reaction. Chemisorption is the main factor ...
(i) Oxidation of sulphur dioxide to form sulphur trioxide. In this reaction, Pt acts as a catalyst. 2SO2(g) 2SO3(g) (ii) Formation of ammonia by ...
The cleansing action of soap is due to emulsification and micelle formation. Soaps are basically sodium and potassium salts of long chain fatty acids,...
The process of decomposition of an emulsion into its constituent liquids is called demulsification. Examples of demulsifiers are surfactants, ethylene...
The colloidal solution in which both the dispersed phase and dispersion medium are liquids is called an emulsion. There are two types of emulsions:...
(i) When a beam of light is passed through a colloidal solution, then scattering of light is observed. This is known as the Tyndall effect. This scatt...
Colloids can be classified on various bases: (i) On the basis of the physical state of the components (by components we mean the dispersed phase an...
Enzymes are basically protein molecules of high molecular masses. These form colloidal solutions when dissolved in water. These are complex, nitrogeno...