Question 2 :
On adding 1 mL of solution of 10% NaCl to 10mL of gold sol in the presence of 0.25g of starch, the coagulation is just prevented. The gold number of starch is

Question 3 :
Which will not form colloidal solution?<br> (Where DP = Dispersion phase and DM = Dispersion medium)

Question 11 :
Which is correct in the case of van der Waals adsorption?

Question 13 :
There is formation of an electrical double layer of opposite charges on the surface of colloidal particles, so a potential develops which is known as

Question 14 :
The catalyst iron, employed in the Habers process, contains molybdenum, the function of which is :

Question 17 :
Mention the type of reaction to obtain Au(sol).<br> Reaction,<br> <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead6a546694ca4eac0fce3b">

Question 20 :
The minimum energy level necessary to permit a reaction to occur is :

Question 21 :
Among the electrolytes ${ Na }_{ 2 }{ SO }_{ 4 },Ca{ Cl }_{ 2 },{ Al }_{ 2 }{ \left( { SO }_{ 4 } \right) }_{ 3 }\quad $ and ${ NH }_{ 4 }Cl$, the most effective coagulating agent for ${ Sb }_{ 2 }{ S }_{ 3 }$ sol is:

Question 22 :
Match the column I and column II and mark the&#160;appropriate choice.<table class="wysiwyg-table"><tbody><tr><td>Column I</td><td>Column II</td></tr><tr><td>(A)&#160;Diastase</td><td>(i) Proteins $\rightarrow$ peptones</td></tr><tr><td>(B)&#160;Pepsin</td><td>(ii) Glucose $\rightarrow$ ethyl alcohol</td></tr><tr><td>(C)&#160;Ptyalin</td><td>(iii) Starch $\rightarrow$ maltose</td></tr><tr><td>(D)&#160;Zymase</td><td>(iv) Starch $\rightarrow$ sugar</td></tr></tbody></table>

Question 23 :
The enzyme ptylin used for the digestion of food is present in

Question 24 :
The volume of gases $NH_3,\;CO_2$ and $CH_4$ adsorbed by one gram of charcoal at 298 K are in the order of ___________ .

Question 25 :
The colloidal system consisting of a liquid adsorbate in a solid adsorbent is termed as:

Question 26 :
Platinised asbestos is used as a catalyst in, the manufacture of $H_2SO_4$. It is an example of:

Question 27 :
When&#160;$KClO_{3}$ is heated, it decomposes into&#160;$KCl+O_{2}$. If some&#160;$MnO_{2}$ is added, the reaction goes much faster because<br/>

Question 29 :
Substances whose solutions can readily diffuse through animal membranes are called:

Question 32 :
Select the correct statements:<br/>1. Rough surface shows more adsorption than smoother surface.<br/>2. Higher is the number of active centres more is adsorption.<br/>3. An increase in concentration of enzymes brings in fruit fermentation earlier.<br/>4. Negative catalyst increases the energy of activation.<br/>

Question 39 :
The volume of gases&#160;$(\displaystyle NH_{3}, CO_{2}$ and $\displaystyle CH_{4})$ adsorbed by one gram of charcoal at $298$ K follows the order:

Question 40 :
Assertion: A catalyst is more effective in finely divided form. Reason: Finely divided form has more surface area.