Question

Gold numbers of protective colloids $A,B,C$ and $D$ are $0.50,0.01,0.10$ and $0.005$ respectively. The correct order of their protective powers is

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

Answer 1

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

Gold numbers of protective colloids $A,B,C$ and $D$ are $0.50,0.01,0.10$ and $0.005$ respectively. The correct order of their protective powers is $A\left(0.50\right)<C\left(0.10\right)<B\left(0.01\right)<D\left(0.005\right)$
Higher is the value of gold number, lower is the protective power.