Q. Write the role of
Dilute $NaCN$ in the extraction of Gold.

Q. Write the role of
$CO$ in the extraction of Iron.

Q. How is leaching carried out in the case of low grade copper ores? Name the method used for refining of copper metal.

Q. Draw the structures of the following :
$H_2{S}_2{O}_7$

Q. Draw the structures of the following :
$Br{F}_5$

Q. Define adsorption with an example. What is the role of adsorption in heterogeneous catalysis?

Q. Define Brownian movement. What is the cause of Brownian movement in colloidal particles? How is it responsible for the stability of Colloidal Sol ?

Q. Identify the monomers in the following polymers :

Q. Identify the monomers in the following polymers :
$-[NH-(C{H}_2{)}_6-NH-\underset{O}{\underset{||}{C}}-(C{H}_2{)}_4-\underset{O}{\underset{||}{C}}-{]}_n$

Q. How do antiseptics differ from disinfectants ? Name a substance which can be used as a disinfectant as well as an antiseptic.

Q. A $0.01$ m aqueous solution of $AlC{l}_3$ freezes at - ${0.068}^{0}C$. Calculate the percentage of dissociation. [Given: $K_f$ for water = $1.86KKgmo{l}^{-1}$]

Q. Why halogens have maximum negative electron gain enthalpy?

Q. Define the following terms with a suitable example:
Polysaccharides

Q. Why fluorine shows anomalous behaviour as compared to other halogens?

Q. Arrange the hydrogen halides (HF to HI) in the decreasing order of their reducing character.

Q. Define the following terms with a suitable example:
Denatured protein

Q. Why fluorine is a stronger oxidizing agent than chlorine?

Q. Define the following terms with a suitable example:
Fibrous protein

Q. What are the size of X and X' in the interhalogen compounds?

Q. When a steady current of $2A$ was passed through two electrolytic cells $A$ and $B$ containing electrolytes $ZnS{O}_4$ and $CuS{O}_4$ connected in series, $2g$ of $Cu$ were deposited at the cathode of cell $B$.

Q. One word answer:
Write the IUPAC name of

Q. Name an artificial sweetener whose use is limited to cold drinks.

Q. Name the polymer which is used for making non-stick utensils.

Q. Write three difference between lyophobic and lyophilic sol.

Q. Define the following term:
Protective colloid

Q. Define the following term:
Zeta potential

Q. Define the following term:
Emulsifying agents

Q. Kohlrausch given the following relation for strong electrolytes:
$\wedge ={\wedge }_0-A\sqrt{C}$
Which of the following equality holds?

1. $\wedge ={\wedge }_0$ as $C\to \sqrt{A}$
2. $\wedge ={\wedge }_0$ as $C\to \infty$
3. $\wedge ={\wedge }_0$ as $C\to 0$
4. $\wedge ={\wedge }_0$ as $C\to 1$

Q. In an electrochemical process, a salt bridge is used:

1. as a reducing agent.
2. as an oxidizing agent.
3. to complete the circuit so that current can flow.
4. None of these

Q. Give reason:
Aniline does not undergo Friedal-Crafts reaction.