Sulphur colloid prepared by

• mechanical dispersion

• oxidation

• electrical dispersion

• reduction

Colour of colloids depends on which of the following factors ?

• Size

• Mass

• Charge

• Nature

43.

Which one of the following reactions is an example of heterogeneous catalysis?

• 2CO (g) + O₂ (g) $\stackrel{\mathrm{NO} \left(\mathrm{g}\right)}{\to }$ 3CO₂

• 2SO₂ (g) + O₂ (g) $\stackrel{\mathrm{NO} \left(\mathrm{g}\right)}{\to }$ 2SO₃

• 2CO (g) + O₂ (g) $\stackrel{\mathrm{Pt} \left(\mathrm{s}\right)}{\to }$ 2CO₂

• CH₃CHO (g) $\stackrel{{\mathrm{I}}_2 \left(\mathrm{g}\right)}{\to }$ CH₄ + CO

Cod liver oil is

• an emulsion

• solution

• colloidal solution

• suspension

Paste is

• suspension of solid in a liquid

• mechanical dispersion of a solid in liquid

• colloidal solution of a solid in solid

• None of the above

The equation for Freundlich adsorption isotherm is

• x/m =kp^1/n

• x= mkp^1/n

• x/m= kp^-n

• All of these

Animal charcoal is used in decolorising colour of liquids because it is a good

• adsorbate

• adsorbent

• oxidising agent

• reducing agent

Which one of the following statements is not correct?

• Physical adsorption decreases with increase in the temperature

• Physical adsorption is multtlayered

• Activation energy of physical adsorption is very high

• Enthalpy change of physical adsorption is about 20 kJ mol

Which one of the following equations represents Freundlich adsorption isotherm ?

• $\frac{\mathrm{x}}{\mathrm{m}}= \mathrm{Kp}$

• $\frac{\mathrm{x}}{\mathrm{m}}= {\mathrm{Kp}}^{\mathrm{n}}$

• $\log \frac{\mathrm{x}}{\mathrm{m}}= {\mathrm{Kp}}^{\mathrm{n}}$

• $\log \frac{\mathrm{x}}{\mathrm{m}}= \mathrm{Kn} \log \mathrm{p}$

Which of the following is a lyophobic colloidal solution?

• Aqueous starch solution

• Aqueous protein solution

• Gold sol

• Polymer solutons in some organic solvents