Question

Gold numbers of protective colloids A, B, C and
D are 0.50, 0.01, 0.10 amd 0.005, respectively. the
correct order of their protective powers is
(a) D < A < C < B (b) C < B < D < A
(c) A < C < B < D (d) B < D < A < C

Answer 1

Answer :- (c) A < C < B < D.

Answer 2

The correct order of their protective powers is (c) A < C < B < D

Explanation:

In a protective power of a colloid, the lesser the number of gold in it the better the protective power of the colloid.

The number of gold in the given colloid is:

A, B, C and  D ⇒ 0.50, 0.01, 0.10 and 0.005

On arranging the number is descending order, we get,

0.50 > 0.10 > 0.01 > 0.005

Now, the protective power of the colloid is:

A < C < B < D