The nature of a charge on resulting colloidal particles when FeCl₃ is added to an excess of hot water is:

Among the following, the method used for the preparation of colloids is-

1. Ostwald Process

2. Van Arkel Method

3. Bredig's Arc Method

4. Mond Process

Tyndall effect is observed when-
1.  The diameter of dispersed particles is similar to the wavelength of light used
2.  The diameter of dispersed particles is much smaller than the wavelength of light used
3.  The refractive index of dispersed phase is greater than that of the dispersion medium
4.  The diameter of dispersed particles is much larger than the wavelength of light used

Kraft temperature is the temperature:

Peptization is a:

Among the following, the incorrect statement about colloids is:

The coagulating power  having ions ${\mathrm{Na}}^{+},{\mathrm{Al}}^{3+}\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{Ba}}^{2+}$ for arsenic sulphide sol increases in the order -

1. ${\mathrm{Ba}}^{2+}<{\mathrm{Na}}^{+}<{\mathrm{Al}}^{3+}$

2. ${\mathrm{Al}}^{3+}<{\mathrm{Na}}^{+}<{\mathrm{Ba}}^{2+}$

3. ${\mathrm{Al}}^{3+}<{\mathrm{Ba}}^{2+}<{\mathrm{Na}}^{+}$

4. ${\mathrm{Na}}^{+}<{\mathrm{Ba}}^{2+}<{\mathrm{Al}}^{3+}$

Most suitable salt which can be used for efficient clotting of blood will be :-

1. NaHCO₃

2. FeSO₄

3. Mg(HCO₃)₂

4. FeCl₃