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Define Gold Number....

Define Gold Number.

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What are protective colloids? Define and explain gold number.

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Define atomic number.

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

What is Gold number ?

The gold number of some colloids are given below {:("Colloid ","Gold number "),(A,0.01),(B,2.5),(C,20):} The protective nature of these colloids follows the order

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?

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.

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'.

VGS PUBLICATION-BRILLIANT-MOST IMPORTANT QUESTIONS-SURFACE CHEMISTRY (SHORT ANSWER TYPE QUESTIONS)
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  2. Name any six enzyme catalysed reaction.

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  3. Explain Tyndall effect and Brownian movement.

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  4. What are lyophilic and lyophobic sols ? Give one example for each type...

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  5. Describe Bredig's arc method of preparation of colloids with a neat di...

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  6. Define Gold Number.

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  7. Explain Zone refining.

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  9. Give examples to differentiate roasting and calcination.

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  10. Explain the purification of sulphide ore by Froth Floatation Method.

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  11. Outline the principles of refining of metals by the following methods....

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  12. Outline the principles of refining of metals by the following methods....

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  13. Outline the principles of refining of metals by the following methods....

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  14. Outline the principles of refining of metals by the following methods....

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  15. Which of the following reagent is used in the extraction of Aluminium ...

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  16. Explain the extraction of Zinc form Zinc blende.

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  17. Write any two ores with formulae of the following metal : Aluminium

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  18. Write any two ores with formulae of the following metal : Zinc

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  19. Write the names and formulae of any two ores of iron

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  20. Write any two ores with formulae of the following metal : Copper

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