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One gram of a protective colloid 'X' is ...

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'.

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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?

Gold number of gelatin is 0.01 , Calculate the weight of gelatin to be added to 50 ml of gold to stop coagulation when 5ml of 10% NaCI added .

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.

What are protective colloids ? Define and explain gold number .

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

What are protective colloids? Define and explain gold number.

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. Gold number of haemoglobin is 0.03. Hence, 10 mL of gold sol will require haemoglobin so that gold is not coagulated by ImL of 10% NaCl solution

AAKASH SERIES-SURFACE CHEMISTRY-EXERCISE - 5.2
  1. The decolourisation of permanganate with oxalate is initially slow, bu...

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  2. How the colloids are classified on the basis of type of particles in d...

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  3. Explain the purification of colloids by dialysis and ultrafiltration.

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  4. What is ultrafiltration ?

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  5. Arrange the following substances in order of increasing ability to coa...

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  6. A catalyst lowered the energy of activation by 25 kJ mol^(-1) .How man...

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  7. Presence of catalysis does not change equilibrium constant. Why?

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  8. Why the reaction between nitric acid and copper is slow in the beginni...

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  9. During the micelle formation how the enthalpy entropy and Gibbes energ...

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  10. Gold number of gelatin is 0.01 , Calculate the weight of gelatin to be...

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  11. The surface are of activated charcoal is 10^(3)m^(3)g^(-1).If effectiv...

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  12. 20% surface sites have adsorbed N2. On heating N2 gas is evolved from ...

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  13. A molecule of nitrogen occupies 1.62 xx 10^(-19) m^(2). The volume of ...

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  14. What is electro osmosis ?

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  15. 0.1 M AlCl3 solution is more effective than 0.1M NaCl solution in coag...

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  16. For coagulation of 20ml of a negative sol Xml of 1M NaCl , Y ml of 1M...

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  17. One gram of a protective colloid 'X' is to be added to 200ml of gold s...

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  18. Soap forms a true solutions a lower concentration. but forms a colloid...

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  19. Soap does not work properly in aqueous solutions with acidic pH values...

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  20. What is de-emulsification process ? How is it performed ?

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