A) A<C<B<D
B) B<D<A<C
C) D<A<C<B
D) C<B<D<A
Correct Answer: A
Solution :
[a] A < C < B < D Gold number: It is the minimum weight of a protective colloid in mg which must be added to 10 ml of a standard red gold sol [contain 0.5 to 0.06 g of gold 1l] so that no coagulation of gold sol takes place when 1mol of 10% sodium chloride solution is rapidly added to it. Smaller the gold number of protective colloid greater is the protective power Thus, \[D\,\text{(}0.005)>B\text{ (}0.01)>C(~0.05)>\text{ }A(0.50)\]
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