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On addiction of 1ml solution of 10% NaCl...

On addiction of 1ml solution of 10% NaCl to 10ml gold sol in the presence of 0.0250gm mof starch, the coagulation is just prevented Starch has the following gold number

A

0.025

B

0.25

C

2.5

D

25

Text Solution

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The correct Answer is:
D
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The coagulation of 100ml gold sol is completely prevented by adding 0.25g of starch to it before adding 10ml of 10% NaCl solution. Calculate the gold number of starch.

The coagulation of 100 ml gold sol is completely prevented by adding 0.25 g of starch to it before adding 10 ml of 10% NaCl solution. Calculate the gold number of starch.

Following passage describes charcterstics of colloids. Answer the questions at the end of it. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which forms a protective layer outside it and thus prevents it from forming associated colloids. Lyophillic colloidal sols also protect lyophobic colloidal sols from precipition by the action of electrolytes. This is due to formation of a protective layer by lyophilic sols outside lyophobic sols. Lyophilic colloidal sols are called protective sols. Gelatin (lyophilic) protects gold sol (lyophobic) from coagulaion on the addition of sodium chloride solution. Protective powers of different colloidal sols are measured in terms of 'gold number' (Zigmody). It is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of 10 percent sodium chloride. Thus smaller the gold number of a lyophillic sol, the greater is the protective power. 0.025g of starch sol is required to prevent coagulation of 10ml gold sol when ImL of 10% Nacl solution is present. What is gold number of starch sol

One gram of a protective colloid 'X' is to be added to 200ml of gold sol to prevent coagulation of it when 20 ml of 10% NaCl is added. Calculate the gold number of protective colloid 'X'.

300 mL of gold sol is mixed with 30 mL of 10% NaCl solution. The mass of haemoglobin in mg required to protect the gold sol from coagulation is (gold number of haemoglobin is 0.03)

When 1.0 xx 10^(-5) mg of a protective colloid is added to 20 ml of standard gold sol, the precipitation of gold sol was prevented by adding 5 ml of 10% solution of NaCl. If the gold number of protective colloid is 2.0 x 10^(-x) mg then x is = __?

Exactly 8mg of a lyophilic 'sol' is added to 20ml of a gold sol to protect against addition of 2ml of 20% NaCl. What is the gold number of the given sol?

AAKASH SERIES-SURFACE CHEMISTRY-Objective Excersice - 2
  1. Smoke, cloud and gold sol are respectively

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  2. When an excess electrolyte is added to a colloidal sol it

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  3. On addiction of 1ml solution of 10% NaCl to 10ml gold sol in the prese...

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  4. Which electrolyte is least effective in causing coagulation of +ve fer...

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  5. Gelatin is often used as an ingredient in the manufacture of ice-cream...

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  6. A colloidal solution is subjected to an electrical field. The particle...

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  7. What is the main cause for charge on a colloidal solution ?

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  8. A substance which forms micelles in solutions contains

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  9. Arsenic (III) sulphide form a sol with a negative charge which of the ...

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  10. A negatively charged suspenstion of clay in water needs for precipitat...

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  11. A colloidal sol Fe(OH)(3) in water is

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  12. Lyophilic sols are more stable than lyophobic sols because

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  13. Ultra microscope works on the principle of

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  14. Celllulose dispersed in ethanol is called

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  15. Gelatin protects

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  16. The coagulation of colloidal particles of the sol can be caused by

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  17. In the coagulating of a positive sol, flocculation powers of Cl^(-), S...

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  18. The coagulating power of an electrolyte for Aresenious sulphide sol de...

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  19. Which of the following is an example of zeolite

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  20. The dispersed phase in colloidal iron (iii) hydroxide and colloidal go...

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