Question

Gold number of haemoglobin is $0.03$. Hence, $100ml$ of gold sol will require haemoglobin so that gold is not coagulated by $10mL$ of $10\%NaCl$ solution:

• A. $0.03mg$
• B. $30mg$
• C. $0.30mg$
• D. $3mg$

Answer 1

Answer: (C)

$0.30mg$

Gold number is the number of milligram of the protective colloid which prevent the coagulation of 10 ml of red gold sol when 1 ml of a 10 percent solution of sodium chloride is added to it.

Here, Gold number of Hb $=$0.03.

So weight of Hb require for 10 ml of gold is 0.03 mg.

So weight require for 100 ml of gold solution is 0.30mg.

Option C is correct.