151. If $$x$$ is the mass of the gas adsorbed on mass $$m$$ of the adsorbent at pressure $$p,$$ Freundlich adsorption isotherm gives a straight line on plotting
A
$$\frac{x}{m}\,{\text{vs}}\,p$$
B
$$\frac{x}{m}\,{\text{vs}}\,\frac{1}{p}$$
C
$${\text{log}}\frac{x}{m}\,{\text{vs}}\,\,{\text{log}}\,p$$
D
$${\text{log}}\,\frac{x}{m}\,{\text{vs}}\,\,p$$
Answer :
$${\text{log}}\frac{x}{m}\,{\text{vs}}\,\,{\text{log}}\,p$$
152. Which of the following electrolyte solutions having the same concentration will be most effective in causing the coagulation of arsenic sulphide sol ?
A
$$KCl$$
B
$$MgC{l_2}$$
C
$$AlC{l_3}$$
D
$$N{a_3}P{O_4}$$
Answer :
$$AlC{l_3}$$
153. Identify the correct statement regarding enzymes $$\_\_\_\_\_\_\_.$$
A
Enzymes are specific biological catalysts that cannot be poisoned
B
Enzymes are normally heterogeneous catalysts that are very specific in their action
C
Enzymes are specific biological catalysts that can normally function at very high temperatures $$\left( {T \approx 1000\,K} \right)$$
D
Enzymes are specific biological catalysts that possess well-defined active sites
Answer :
Enzymes are specific biological catalysts that possess well-defined active sites
154. Identify the correct statement regarding enzymes
A
Enzymes are specific biological catalysts that cannot be poisoned
B
Enzymes are normally heterogeneous catalysts that are very specific in their action
C
Enzymes are specific biological catalysts that can normally function at very high temperatures $$\left( {T \sim 1000K} \right)$$
D
Enzymes are specific biological catalysts that possess well-defined active sites
Answer :
Enzymes are specific biological catalysts that possess well-defined active sites
155.
Which of the following statements is/are correct regarding stability of sol?
(i) Lyophilic sols are stabilised due to a layer of solvent around sol particles.
(ii) Lyophobic sols are stabilised due to presence of charge.
(iii) Addition of lyophilic sols brings more stability to lyophobic sols.
(iv) Addition of lyophobic sols brings more stability to lyophilic sols.
A
(ii) only
B
(i) and (iv) only
C
(i), (ii) and (iii) only
D
All of these
Answer :
(i), (ii) and (iii) only
156. Which of the following adsorption isotherms represents the absorption of a gas by a solid involving multilayers of formation? ( $$Ps =$$ saturation pressure )
A
B
C
D
Answer :
157. On addition of $$1\,mL$$ of $$10\% \,NaCl$$ solution to $$10\,mL$$ gold sol in the presence of $$0.025\,g$$ of starch, the coagulation is just prevented. Starch has gold number
A
2.5
B
25
C
0.25
D
0.025
Answer :
25
158. Equal volume each of two sols of $$AgI,$$ one obtained by adding $$AgN{O_3}$$ to slight excess of $$KI$$ and another obtained by adding $$KI$$ to slight excess of $$AgN{O_3},$$ are mixed together. Then :
A
the two sols will stabilize each other
B
the sol particles will acquire more electric charge
C
the sols will coagulate each other mutually
D
a true solution will be obtained
Answer :
the sols will coagulate each other mutually
160.
Which of the following statements are correct?
(i) The smaller the gold number of lyophilic colloid, the larger will be its protective power.
(ii) Lyophilic sols, in contrast to lyophobic sols can easily coagulate on addition of small amounts of electrolytes.
(iii) Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulates the blood.
(iv) The flocculation value of arsenious sulphide sol is independent of the anion of the coagulating electrolyte.
A
(i), (ii) and (iii)
B
(i), (iii) and (iv)
C
(ii), (iii) and (iv)
D
(i), (ii) and (iv)
Answer :
(i), (iii) and (iv)