Blue colour of water in sea is due to :

• refraction of blue light by impurities in sea water

• refraction of blue sky by water

• scattering of light by impurities

• All of the above

In aerosol, the dispersion medium is :

• solid

• liquid

• gas

• all of the above

A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called

• Tyndall effect

• Brownian effect

• Hardy- Schulze effect

• none of these

Hair cream is

• gel

• emulsion

• solid sol

• sol

According to Hardy schulze law, the flocculating power of an ion increases with

• decreases in size

• increase in size

• decrease in charge

• increase in charge

Butter is an example of which type of colloid?

• Solid in liquid

• Liquid in solid

• Liquid in liquid

• Gas in liquid

197.

Which of the following is incorrect for physisorption?

• Reversible

• Increases with increase in temperature.

• Low heat of adsorption.

• Increases with increase in surface area.

When a sulphur sol is evaporated sulphur is obtained .On mixing with water sulphur sol is not formed .The sol is :

• lyophilic

• reversible

• hydrophobic

• hydrophilic

An example for autocatalysis is :

• oxidation of NO to NO₂

• oxidation of SO₂ to SO₃

• decomposition of KClO₃ to KCl and O₂

• oxidation of oxalic acid by acidified KMnO₄

Correct equation of Freundlich isotherm is

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right)= \mathrm{logk} + \frac{1}{\mathrm{n}}\log \mathrm{c}$

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right) = \log \mathrm{c}+\frac{1}{\mathrm{n}}\log \mathrm{k}$

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right)= \log \mathrm{c} +\frac{1}{\mathrm{k}} \log \mathrm{c}$

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right) = \mathrm{logk} + \frac{1}{\mathrm{k}}\log \mathrm{c}$