Q21 of 53 Page 1

What are emulsions? What are their different types? Give one example of each type.

Emulsions are the colloids which have both dispersion phase and dispersion medium in liquid form, i.e., it is a liquid-liquid type of colloid. Some of the examples of emulsions are milk, egg yolk, etc.


There are two different types of emulsions:


1- Oil in water type (O/W type) Example- Milk


2- Water in oil type (W/O type) Example- Butter


More from this chapter

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19

(a) Calculate ΔrG0 for the reaction:

Mg(s) + Cu2+ (aq) → Mg2+(aq) + Cu(s)


(Given: E0cell = +2.71V, 1F = 96500 C/mol)


(b) Name the type of cell which was used in Apollo space programme for providing electrical power.


 20

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume:

SO2Cl2(g) → SO2(g) + Cl2(g)


Experiment Time/ s-1 Total pressure/atm


1 0 0.4


2 100 0.7


Calculate the rate constant.


(Given: log 4 = 0.6021, log 2 =0.3010)


 22

Give reasons for the following:

(i) (CH3)3P=O exists but (CH3)3N=O does not


(ii) ) Oxygen has less electron gain enthalpy with negative sign than sulphur.


(iii) H3PO2 is a stronger reducing agent than H3PO3


 23

(i) Write the IUPAC name of the complex [Cr(NH3)4Cl2]Cl.

(ii) What type of isomerism is exhibited by the complex [Co(en)3]3+?


(en= ethane-1,2-diamine)


(iii) Why is [NiCl4]2- paramagnetic but is [Ni(CO)4] is diamagnetic?


(Atomic No: Cr=24, Co=27,Ni=28)