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- Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10, 0.005, respectively. The correct order of their protective powers is:Option: 1 <
- #Joint Entrance Examination Main
- #Chemistry
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- #Amrita Engineering Entrance Examination
- #Surface Chemistry
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10, 0.005, respectively. The correct order of their protective powers is:
B<D<A<C
D<A<C<B
C<B<D<A
A<C<B<D
Answers (1)
The gold number is the number of milligrams of the protective colloid needed to prevent the coagulation of a standard 10 ml gold sol when 1ml of 10% solution of sodium chloride is added to it.
So, lesser is the amount of protective sol added for preventing the formation of a precipitate, lesser is the gold number and more is the protecting power.
Gold numbers of protective colloids A, B, C, and D are 0.50,0.01,0.10 and 0.005 respectively.
Higher is the value of the gold number, lower is the protective power.
The correct order of their protective powers is
A(0.50)<C(0.10)<B(0.01)<D(0.005)
Therefore, the option number (4) is correct.
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