Question

Gold number is associated with-

• A. Electrophoresis
• B. Purple of cassius
• C. Protective colloid
• D. Amount of pure gold

Answer 1

The correct option is C

Protective colloid

Explanation for correct answer:-

Option (C) Protective colloid

1. Lyophilic colloid is called as protective colloid, which means when present in small quantities keeps lyophilic colloids from precipitating under coagulating action of electrolytes.
2. Gold number is the protective power of lyophilic colloid.
3. Hence option (C) is correct.

Explanation for incorrect answer:-

Option (A) Electrophoresis

1. It is a kinetic process which separates the charged particles separately in the protein molecules.
2. Hence option (A) is incorrect.

Option (B) Purple of Cassius

1. It is a purple colored pigment formed by the reaction of Gold salts with tin chloride, and used for testing of gold.
2. Hence, option (B) is incorrect.

Option (D) Amount of Pure Gold

1. Amount of pure gold means 24-carat gold.
2. Hence, Option (B) is incorrect.

Therefore, we can conclude that gold number is associated with protective colloid. Hence, option (C) is correct.