On addition of one ml solution of 10 % NaCl to 10 ml gold sol in the presence of 0.250 g of starch, the coagulation is just prevented. Starch has the following gold number.
Correct answer: D. 250
- A. 0. 025
- B. 0.25
- C. 2.5
- D. 250
Explanation
According to the definition of gold number, in this case starch has gold number of 250.
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Solutions are described using molarity, molality, normality, mole fraction, percentage concentration and parts per million. Coverage also includes vapour-pressure lowering, boiling-point elevation, freezing-point depression and osmotic pressure, then distinguishes true solutions, colloids and suspensions by particle size, stability, light scattering and settling.
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