Question

Gold number of protective colloids $A,B,C\text{and}D$ are $0.50,0.01,0.10$ and $0.005$ respectively. The correct order of their protective power is:

• A. $D<A<C<B$
• B. $C<B<D<A$
• C. $A<C<B<D$
• D. $B<D<A<C$

Answer 1

The correct option is C $A<C<B<D$

For a protective colloid, lesser is the value of gold number better is the protective power.
Thus the correct order of protective power for the given colloids is $A<C<B<D$