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Gold number of gelatin is 0.01 , Calcula...

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 .

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The correct Answer is:
`0.05 mg`
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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

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The mass of haemoglobin in mg required to protect from coagulation of 50 mL of a gold sol on adding 5 mL of 10 % NaCl solution is (gold number of haemoglobin = 0.03)

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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