Colloids

What is emulsion?

Copper sol is coagulated most easily by

Coagulating value of the electrolytes ${\mathrm{AlCl}}_3$ and $\mathrm{NaCl}$ tor ${\mathrm{As}}_2 {\mathrm{S}}_3$ are $0.09$ and $50.04$ respectively. The coagulating power of ${\mathrm{AlCl}}_3$ is $\mathrm{x}$ times the coagulating power of $\mathrm{NaCl}$. The value of $\mathrm{x}$ is

$20 \mathrm{mL}$ of $0.5 \mathrm{M} \mathrm{NaCl}$ is required to coagulate $200 \mathrm{mL}$ of ${\mathrm{As}}_2{\mathrm{S}}_3$ solution in $2$ hours. The coagulating value of $\mathrm{NaCl}$ is ___________ milli moles.

The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is _____.

Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather

$25 \mathrm{mL}$ of silver nitrate solution $\left(1\mathrm{M}\right)$ is added dropwise to $25 \mathrm{mL}$ of potassium iodide $(1.05 \mathrm{M})$ solution. The ion(s) present in very small quantity in the solution is/are

To $25\mathrm{ml}$ of $1.05\mathrm{M} \mathrm{KI} , 1 \mathrm{M} {\mathrm{AgNO}}_3$ is added drop wise. In the colloidal solution formed, fixed and diffused layer consists of respectively:(${\mathrm{AgNO}}_3$ is in excess)

What is emulsification?

For the coagulation of 100 mL of arsenious sulphide solution, $5 \mathrm{mL} \mathrm{of} 1 \mathrm{M} \mathrm{NaCl}$ is required. What is the coagulating power of NaCl?

$100 \mathrm{ml} \mathrm{of} 5\% (\mathrm{w}/\mathrm{v})$ solution of $\mathrm{NaCl}$in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred well. This resulted in a/an

For ${\mathrm{As}}_2{\mathrm{S}}_3$ sol, the most effective coagulating agent is

The macromolecular colloids of the following are

I. Starch solution

II. Sulphur sol

III. Synthetic detergent

IV. Synthetic rubber

Given below are two statements :
Statement $\mathrm{I}$ :
In the coagulation of a negative sol, the flocculating power of the three given ions is in the order -
${\mathrm{Al}}^{3+}>{\mathrm{Ba}}^{2+}>{\mathrm{Na}}^{+}$
Statement $\mathrm{II}$ :
In the coagulation of a positive sol, the flocculating power of the three given salts is in the order -
$\mathrm{NaCl}>{\mathrm{Na}}_2{\mathrm{SO}}_4>{\mathrm{Na}}_3{\mathrm{PO}}_4$
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following ions will have maximum flocculating power for coagulation of ${\mathrm{As}}_2{\mathrm{S}}_3$ sol?

Which of the following is a reversible sol?

On the basis of Hardy-Schulze rule, explain why coagulating power of phosphate is higher than chloride.

Why does leather get hardened after tanning?